Add m-esr52 at 52.6.0

7 files changed, 1016 insertions, 0 deletions

diff --git a/testing/web-platform/tests/encrypted-media/polyfill/cast-polyfill.js b/testing/web-platform/tests/encrypted-media/polyfill/cast-polyfill.js
new file mode 100644
index 000000000..576e0ad04
--- /dev/null
+++ b/testing/web-platform/tests/encrypted-media/polyfill/cast-polyfill.js
@@ -0,0 +1,80 @@
+(function() {
+
+    if ( /CrKey\/[0-9]+\.[0-9a-z]+\.[0-9a-z]+/i.exec( navigator.userAgent ) ) {
+
+        var castscript = document.createElement('script');
+        castscript.type = 'text/javascript';
+        castscript.src = 'https://www.gstatic.com/cast/sdk/libs/receiver/2.0.0/cast_receiver.js'
+        document.head.appendChild( castscript );
+
+        var _requestMediaKeySystemAccess = navigator.requestMediaKeySystemAccess.bind( navigator ),
+            _setMediaKeys = HTMLMediaElement.prototype.setMediaKeys,
+            _load = MediaKeySession.prototype.load;
+
+        MediaKeySession.prototype.load = function load()
+        {
+            return _load.call( this ).then( function( success )
+            {
+                return success ? this.remove() : false;
+            }.bind( this ) );
+        };
+
+        function MediaKeys( mediaKeys )
+        {
+            this._mediaKeys = mediaKeys;
+        }
+
+        MediaKeys.prototype.setServerCertificate = function setServerCertificate( certificate )
+        {
+            return this._mediaKeys.setServerCertificate( certificate );
+        };
+
+        MediaKeys.prototype.createSession = function createSession( sessionType ) {
+
+            if ( sessionType === 'persistent-usage-record' )
+            {
+                return cast.receiver.eme.KeySession.createSession( this._mediaKeys, 'persistent-release-message' );
+            }
+
+            return this._mediaKeys.createSession( sessionType );
+        };
+
+        function MediaKeySystemAccess( access )
+        {
+            this._access = mediaKeySystemAccess;
+        }
+
+        Object.defineProperty( MediaKeySystemAccess.prototype, 'keySystem', { get: function() { return this._access.keySystem; } } );
+
+        MediaKeySystemAccess.prototype.getConfiguration = function getConfiguration() { return this._access.getConfiguration(); };
+
+        MediaKeySystemAccess.prototype.createMediaKeys = function createMediaKeys() {
+
+            return this._access.createMediaKey().then( function( mediaKeys ) { return new MediaKeys( mediaKeys ); } );
+
+        };
+
+        HTMLMediaElement.prototype.setMediaKeys = function setMediaKeys( mediaKeys )
+        {
+            if ( mediaKeys instanceof MediaKeys )
+            {
+                return _setMediaKeys.call( this, mediaKeys._mediaKeys );
+            }
+            else
+            {
+                return _setMediaKeys.call( this, mediaKeys );
+            }
+        };
+
+        navigator.requestMediaKeySystemAccess = function requestMediaKeySystemAccess( keysystem, supportedConfigurations ) {
+
+            if ( keysystem !== 'com.chromecast.playready' )
+            {
+                return _requestMediaKeySystemAccess( keysystem, supportedConfigurations );
+            }
+
+            return _requestMediaKeySystemAccess( keysystem, supportedConfigurations )
+            .then( function( access ) { return new MediaKeySystemAccess( access ); } );
+        };
+    }
+})();
\ No newline at end of file
diff --git a/testing/web-platform/tests/encrypted-media/polyfill/chrome-polyfill.js b/testing/web-platform/tests/encrypted-media/polyfill/chrome-polyfill.js
new file mode 100644
index 000000000..2f11497cc
--- /dev/null
+++ b/testing/web-platform/tests/encrypted-media/polyfill/chrome-polyfill.js
@@ -0,0 +1,37 @@
+(function(){
+    if( navigator.userAgent.toLowerCase().indexOf('edge') === -1
+            && navigator.userAgent.toLowerCase().indexOf('chrome') > -1){
+
+        if ( ( /chrome\/([0-9]*)\./.exec( navigator.userAgent.toLowerCase() )[1] | 0 ) < 54 ) {
+
+            // Work around https://bugs.chromium.org/p/chromium/issues/detail?id=622956
+            // Chrome does not fire the empty keystatuschange event when a session is closed
+            var _mediaKeySessionClose = MediaKeySession.prototype.close;
+            var _mediaKeySessionKeyStatusesGetter = Object.getOwnPropertyDescriptor( MediaKeySession.prototype, 'keyStatuses' ).get;
+            var _emptyMediaKeyStatusMap = { size: 0,
+                                            has:    function() { return false; },
+                                            get:    function() { return undefined; },
+                                            entries:function() { return []; },          // this may not be correct, I think it should be some iterator thing
+                                            keys:   function() { return []; },
+                                            values: function() { return []; },
+                                            forEach:function() { return; } };
+
+            MediaKeySession.prototype.close = function close()
+            {
+                this.__closed = true;
+
+                setTimeout( function() {
+                        this.dispatchEvent( new Event( 'keystatuseschange' ) );
+                }.bind( this ), 0 );
+
+                return _mediaKeySessionClose.call( this );
+            };
+
+            Object.defineProperty( MediaKeySession.prototype, 'keyStatuses', { get: function() {
+
+                return this.__closed ? _emptyMediaKeyStatusMap : _mediaKeySessionKeyStatusesGetter.call( this );
+
+            } } );
+        }
+    }
+}());
diff --git a/testing/web-platform/tests/encrypted-media/polyfill/clearkey-polyfill.js b/testing/web-platform/tests/encrypted-media/polyfill/clearkey-polyfill.js
new file mode 100644
index 000000000..057ea3e03
--- /dev/null
+++ b/testing/web-platform/tests/encrypted-media/polyfill/clearkey-polyfill.js
@@ -0,0 +1,510 @@
+(function(){
+
+    // Save platform functions that will be modified
+    var _requestMediaKeySystemAccess = navigator.requestMediaKeySystemAccess.bind( navigator ),
+        _setMediaKeys = HTMLMediaElement.prototype.setMediaKeys;
+
+    // Allow us to modify the target of Events
+    Object.defineProperties( Event.prototype, {
+        target: {   get: function() { return this._target || this.currentTarget; },
+                    set: function( newtarget ) { this._target = newtarget; } }
+    } );
+
+    var EventTarget = function(){
+        this.listeners = {};
+    };
+
+    EventTarget.prototype.listeners = null;
+
+    EventTarget.prototype.addEventListener = function(type, callback){
+      if(!(type in this.listeners)) {
+        this.listeners[type] = [];
+      }
+      this.listeners[type].push(callback);
+    };
+
+    EventTarget.prototype.removeEventListener = function(type, callback){
+      if(!(type in this.listeners)) {
+        return;
+      }
+      var stack = this.listeners[type];
+      for(var i = 0, l = stack.length; i < l; i++){
+        if(stack[i] === callback){
+          stack.splice(i, 1);
+          return this.removeEventListener(type, callback);
+        }
+      }
+    };
+
+    EventTarget.prototype.dispatchEvent = function(event){
+      if(!(event.type in this.listeners)) {
+        return;
+      }
+      var stack = this.listeners[event.type];
+      event.target = this;
+      for(var i = 0, l = stack.length; i < l; i++) {
+        stack[i].call(this, event);
+      }
+    };
+
+    function MediaKeySystemAccessProxy( keysystem, access, configuration )
+    {
+        this._keysystem = keysystem;
+        this._access = access;
+        this._configuration = configuration;
+    }
+
+    Object.defineProperties( MediaKeySystemAccessProxy.prototype, {
+        keysystem: { get: function() { return this._keysystem; } }
+    });
+
+    MediaKeySystemAccessProxy.prototype.getConfiguration = function getConfiguration()
+    {
+        return this._configuration;
+    };
+
+    MediaKeySystemAccessProxy.prototype.createMediaKeys = function createMediaKeys()
+    {
+        return new Promise( function( resolve, reject ) {
+
+            this._access.createMediaKeys()
+            .then( function( mediaKeys ) { resolve( new MediaKeysProxy( mediaKeys ) ); })
+            .catch( function( error ) { reject( error ); } );
+
+        }.bind( this ) );
+    };
+
+    function MediaKeysProxy( mediaKeys )
+    {
+        this._mediaKeys = mediaKeys;
+        this._sessions = [ ];
+        this._videoelement = undefined;
+        this._onTimeUpdateListener = MediaKeysProxy.prototype._onTimeUpdate.bind( this );
+    }
+
+    MediaKeysProxy.prototype._setVideoElement = function _setVideoElement( videoElement )
+    {
+        if ( videoElement !== this._videoelement )
+        {
+            if ( this._videoelement )
+            {
+                this._videoelement.removeEventListener( 'timeupdate', this._onTimeUpdateListener );
+            }
+
+            this._videoelement = videoElement;
+
+            if ( this._videoelement )
+            {
+                this._videoelement.addEventListener( 'timeupdate', this._onTimeUpdateListener );
+            }
+        }
+    };
+
+    MediaKeysProxy.prototype._onTimeUpdate = function( event )
+    {
+        this._sessions.forEach( function( session  ) {
+
+            if ( session._sessionType === 'persistent-usage-record' )
+            {
+                session._onTimeUpdate( event );
+            }
+
+        } );
+    };
+
+    MediaKeysProxy.prototype._removeSession = function _removeSession( session )
+    {
+        var index = this._sessions.indexOf( session );
+        if ( index !== -1 ) this._sessions.splice( index, 1 );
+    };
+
+    MediaKeysProxy.prototype.createSession = function createSession( sessionType )
+    {
+        if ( !sessionType || sessionType === 'temporary' ) return this._mediaKeys.createSession();
+
+        var session = new MediaKeySessionProxy( this, sessionType );
+        this._sessions.push( session );
+
+        return session;
+    };
+
+    MediaKeysProxy.prototype.setServerCertificate = function setServerCertificate( certificate )
+    {
+        return this._mediaKeys.setServerCertificate( certificate );
+    };
+
+    function MediaKeySessionProxy( mediaKeysProxy, sessionType )
+    {
+        EventTarget.call( this );
+
+        this._mediaKeysProxy = mediaKeysProxy
+        this._sessionType = sessionType;
+        this._sessionId = "";
+
+        // MediaKeySessionProxy states
+        // 'created' - After initial creation
+        // 'loading' - Persistent license session waiting for key message to load stored keys
+        // 'active' - Normal active state - proxy all key messages
+        // 'removing' - Release message generated, waiting for ack
+        // 'closed' - Session closed
+        this._state = 'created';
+
+        this._closed = new Promise( function( resolve ) { this._resolveClosed = resolve; }.bind( this ) );
+    }
+
+    MediaKeySessionProxy.prototype = Object.create( EventTarget.prototype );
+
+    Object.defineProperties( MediaKeySessionProxy.prototype, {
+
+        sessionId:  { get: function() { return this._sessionId; } },
+        expiration: { get: function() { return NaN; } },
+        closed:     { get: function() { return this._closed; } },
+        keyStatuses:{ get: function() { return this._session.keyStatuses; } },       // TODO this will fail if examined too early
+        _kids:      { get: function() { return this._keys.map( function( key ) { return key.kid; } ); } },
+    });
+
+    MediaKeySessionProxy.prototype._createSession = function _createSession()
+    {
+        this._session = this._mediaKeysProxy._mediaKeys.createSession();
+
+        this._session.addEventListener( 'message', MediaKeySessionProxy.prototype._onMessage.bind( this ) );
+        this._session.addEventListener( 'keystatuseschange', MediaKeySessionProxy.prototype._onKeyStatusesChange.bind( this ) );
+    };
+
+    MediaKeySessionProxy.prototype._onMessage = function _onMessage( event )
+    {
+        switch( this._state )
+        {
+            case 'loading':
+                this._session.update( toUtf8( { keys: this._keys } ) )
+                .then( function() {
+                    this._state = 'active';
+                    this._loaded( true );
+                }.bind(this)).catch( this._loadfailed );
+
+                break;
+
+            case 'active':
+                this.dispatchEvent( event );
+                break;
+
+            default:
+                // Swallow the event
+                break;
+        }
+    };
+
+    MediaKeySessionProxy.prototype._onKeyStatusesChange = function _onKeyStatusesChange( event )
+    {
+        switch( this._state )
+        {
+            case 'active' :
+            case 'removing' :
+                this.dispatchEvent( event );
+                break;
+
+            default:
+                // Swallow the event
+                break;
+        }
+    };
+
+    MediaKeySessionProxy.prototype._onTimeUpdate = function _onTimeUpdate( event )
+    {
+        if ( !this._firstTime ) this._firstTime = Date.now();
+        this._latestTime = Date.now();
+        this._store();
+    };
+
+    MediaKeySessionProxy.prototype._queueMessage = function _queueMessage( messageType, message )
+    {
+        setTimeout( function() {
+
+            var messageAsArray = toUtf8( message ).buffer;
+
+            this.dispatchEvent( new MediaKeyMessageEvent( 'message', { messageType: messageType, message: messageAsArray } ) );
+
+        }.bind( this ) );
+    };
+
+    function _storageKey( sessionId )
+    {
+        return sessionId;
+    }
+
+    MediaKeySessionProxy.prototype._store = function _store()
+    {
+        var data;
+
+        if ( this._sessionType === 'persistent-usage-record' )
+        {
+            data = { kids: this._kids };
+            if ( this._firstTime ) data.firstTime = this._firstTime;
+            if ( this._latestTime ) data.latestTime = this._latestTime;
+        }
+        else
+        {
+            data = { keys: this._keys };
+        }
+
+        window.localStorage.setItem( _storageKey( this._sessionId ), JSON.stringify( data ) );
+    };
+
+    MediaKeySessionProxy.prototype._load = function _load( sessionId )
+    {
+        var store = window.localStorage.getItem( _storageKey( sessionId ) );
+        if ( store === null ) return false;
+
+        var data;
+        try { data = JSON.parse( store ) } catch( error ) {
+            return false;
+        }
+
+        if ( data.kids )
+        {
+            this._sessionType = 'persistent-usage-record';
+            this._keys = data.kids.map( function( kid ) { return { kid: kid }; } );
+            if ( data.firstTime ) this._firstTime = data.firstTime;
+            if ( data.latestTime ) this._latestTime = data.latestTime;
+        }
+        else
+        {
+            this._sessionType = 'persistent-license';
+            this._keys = data.keys;
+        }
+
+        return true;
+    };
+
+    MediaKeySessionProxy.prototype._clear = function _clear()
+    {
+        window.localStorage.removeItem( _storageKey( this._sessionId ) );
+    };
+
+    MediaKeySessionProxy.prototype.generateRequest = function generateRequest( initDataType, initData )
+    {
+        if ( this._state !== 'created' ) return Promise.reject( new InvalidStateError() );
+
+        this._createSession();
+
+        this._state = 'active';
+
+        return this._session.generateRequest( initDataType, initData )
+        .then( function() {
+            this._sessionId = Math.random().toString(36).slice(2);
+        }.bind( this ) );
+    };
+
+    MediaKeySessionProxy.prototype.load = function load( sessionId )
+    {
+        if ( this._state !== 'created' ) return Promise.reject( new InvalidStateError() );
+
+        return new Promise( function( resolve, reject ) {
+
+            try
+            {
+                if ( !this._load( sessionId ) )
+                {
+                    resolve( false );
+
+                    return;
+                }
+
+                this._sessionId = sessionId;
+
+                if ( this._sessionType === 'persistent-usage-record' )
+                {
+                    var msg = { kids: this._kids };
+                    if ( this._firstTime ) msg.firstTime = this._firstTime;
+                    if ( this._latestTime ) msg.latestTime = this._latestTime;
+
+                    this._queueMessage( 'license-release', msg );
+
+                    this._state = 'removing';
+
+                    resolve( true );
+                }
+                else
+                {
+                    this._createSession();
+
+                    this._state = 'loading';
+                    this._loaded = resolve;
+                    this._loadfailed = reject;
+
+                    var initData = { kids: this._kids };
+
+                    this._session.generateRequest( 'keyids', toUtf8( initData ) );
+                }
+            }
+            catch( error )
+            {
+                reject( error );
+            }
+        }.bind( this ) );
+    };
+
+    MediaKeySessionProxy.prototype.update = function update( response )
+    {
+        return new Promise( function( resolve, reject ) {
+
+            switch( this._state ) {
+
+                case 'active' :
+
+                    var message = fromUtf8( response );
+
+                    // JSON Web Key Set
+                    this._keys = message.keys;
+
+                    this._store();
+
+                    resolve( this._session.update( response ) );
+
+                    break;
+
+                case 'removing' :
+
+                    this._state = 'closed';
+
+                    this._clear();
+
+                    this._mediaKeysProxy._removeSession( this );
+
+                    this._resolveClosed();
+
+                    delete this._session;
+
+                    resolve();
+
+                    break;
+
+                default:
+                    reject( new InvalidStateError() );
+            }
+
+        }.bind( this ) );
+    };
+
+    MediaKeySessionProxy.prototype.close = function close()
+    {
+        if ( this._state === 'closed' ) return Promise.resolve();
+
+        this._state = 'closed';
+
+        this._mediaKeysProxy._removeSession( this );
+
+        this._resolveClosed();
+
+        var session = this._session;
+        if ( !session ) return Promise.resolve();
+
+        this._session = undefined;
+
+        return session.close();
+    };
+
+    MediaKeySessionProxy.prototype.remove = function remove()
+    {
+        if ( this._state !== 'active' || !this._session ) return Promise.reject( new DOMException('InvalidStateError('+this._state+')') );
+
+        this._state = 'removing';
+
+        this._mediaKeysProxy._removeSession( this );
+
+        return this._session.close()
+        .then( function() {
+
+            var msg = { kids: this._kids };
+
+            if ( this._sessionType === 'persistent-usage-record' )
+            {
+                if ( this._firstTime ) msg.firstTime = this._firstTime;
+                if ( this._latestTime ) msg.latestTime = this._latestTime;
+            }
+
+            this._queueMessage( 'license-release', msg );
+
+        }.bind( this ) )
+    };
+
+    HTMLMediaElement.prototype.setMediaKeys = function setMediaKeys( mediaKeys )
+    {
+        if ( mediaKeys instanceof MediaKeysProxy )
+        {
+            mediaKeys._setVideoElement( this );
+            return _setMediaKeys.call( this, mediaKeys._mediaKeys );
+        }
+        else
+        {
+            return _setMediaKeys.call( this, mediaKeys );
+        }
+    };
+
+    navigator.requestMediaKeySystemAccess = function( keysystem, configurations )
+    {
+        // First, see if this is supported by the platform
+        return new Promise( function( resolve, reject ) {
+
+            _requestMediaKeySystemAccess( keysystem, configurations )
+            .then( function( access ) { resolve( access ); } )
+            .catch( function( error ) {
+
+                if ( error instanceof TypeError ) reject( error );
+
+                if ( keysystem !== 'org.w3.clearkey' ) reject( error );
+
+                if ( !configurations.some( is_persistent_configuration ) ) reject( error );
+
+                // Shallow copy the configurations, swapping out the labels and omitting the sessiontypes
+                var configurations_copy = configurations.map( function( config, index ) {
+
+                    var config_copy = copy_configuration( config );
+                    config_copy.label = index.toString();
+                    return config_copy;
+
+                } );
+
+                // And try again with these configurations
+                _requestMediaKeySystemAccess( keysystem, configurations_copy )
+                .then( function( access ) {
+
+                    // Create the supported configuration based on the original request
+                    var configuration = access.getConfiguration(),
+                        original_configuration = configurations[ configuration.label ];
+
+                    // If the original configuration did not need persistent session types, then we're done
+                    if ( !is_persistent_configuration( original_configuration ) ) resolve( access );
+
+                    // Create the configuration that we will return
+                    var returned_configuration = copy_configuration( configuration );
+
+                    if ( original_configuration.label )
+                        returned_configuration.label = original_configuration;
+                    else
+                        delete returned_configuration.label;
+
+                    returned_configuration.sessionTypes = original_configuration.sessionTypes;
+
+                    resolve( new MediaKeySystemAccessProxy( keysystem, access, returned_configuration ) );
+                } )
+                .catch( function( error ) { reject( error ); } );
+            } );
+        } );
+    };
+
+    function is_persistent_configuration( configuration )
+    {
+        return configuration.sessionTypes &&
+                ( configuration.sessionTypes.indexOf( 'persistent-usage-record' ) !== -1
+                || configuration.sessionTypes.indexOf( 'persistent-license' ) !== -1 );
+    }
+
+    function copy_configuration( src )
+    {
+        var dst = {};
+        [ 'label', 'initDataTypes', 'audioCapabilities', 'videoCapabilities', 'distinctiveIdenfifier', 'persistentState' ]
+        .forEach( function( item ) { if ( src[item] ) dst[item] = src[item]; } );
+        return dst;
+    }
+}());
diff --git a/testing/web-platform/tests/encrypted-media/polyfill/edge-keystatuses.js b/testing/web-platform/tests/encrypted-media/polyfill/edge-keystatuses.js
new file mode 100644
index 000000000..886144459
--- /dev/null
+++ b/testing/web-platform/tests/encrypted-media/polyfill/edge-keystatuses.js
@@ -0,0 +1,144 @@
+(function() {
+
+    // This polyfill fixes the following problems with Edge browser
+    // (1) Various maplike methods for keystatuses are not supported or suported incorrectly
+    // (2) Key Ids exposed in keystatuses are incorrect (byte swaps)
+    if ( navigator.userAgent.toLowerCase().indexOf('edge') > -1 ) {
+        ///////////////////////////////////////////////////////////////////////////////////////////////
+        // The following function is the core of this JS patch. The rest of this file is infrastructure
+        // required to enable this function
+        ///////////////////////////////////////////////////////////////////////////////////////////////
+        function _proxyKeyStatusesChange( event ) {
+            this._keyStatuses.clear();
+            var keyStatuses = [];
+            this._session.keyStatuses.forEach( function( keyId, status ) {
+                var newKeyId = new Uint8Array( keyId );
+
+                function swap( arr, a, b ) { var t = arr[a]; arr[a] = arr[b]; arr[b] = t; }
+                swap( newKeyId, 0, 3 );
+                swap( newKeyId, 1, 2 );
+                swap( newKeyId, 4, 5 );
+                swap( newKeyId, 6, 7 );
+
+                keyStatuses.push( { key: newKeyId, status: status, ord: arrayBufferAsString( newKeyId ) } );
+            });
+
+            function lexicographical( a, b ) { return a < b ? -1 : a === b ? 0 : +1; }
+            function lexicographicalkey( a, b ) { return lexicographical( a.ord, b.ord ); }
+
+            keyStatuses.sort( lexicographicalkey ).forEach( function( obj ) {
+                this._keyStatuses._set( obj.key, obj.status );
+            }.bind( this ) );
+
+            this.dispatchEvent( event );
+        };
+        ///////////////////////////////////////////////////////////////////////////////////////////////
+
+        // Override MediaKeys.createSession
+        var _mediaKeysCreateSession = MediaKeys.prototype.createSession;
+        MediaKeys.prototype.createSession = function ( sessionType ) {
+            return new MediaKeySession( _mediaKeysCreateSession.call( this, sessionType ) );
+        };
+
+        // MediaKeySession proxy
+        function MediaKeySession( session ) {
+            EventTarget.call( this );
+            this._session = session;
+            this._keyStatuses = new MediaKeyStatusMap();
+            this._session.addEventListener("keystatuseschange",this._onKeyStatusesChange.bind(this));
+            this._session.addEventListener("message",this.dispatchEvent.bind(this));
+        }
+
+        MediaKeySession.prototype = Object.create( EventTarget.prototype );
+
+        Object.defineProperties( MediaKeySession.prototype, {
+            sessionId:  { get: function() { return this._session.sessionId; } },
+            expiration: { get: function() { return this._session.expiration; } },
+            closed:     { get: function() { return this._session.closed; } },
+            keyStatuses:{ get: function() { return this._keyStatuses; } }
+        });
+
+        [ "generateRequest", "load", "update", "remove", "close" ].forEach( function( fnname ) {
+            MediaKeySession.prototype[ fnname ] = function() {
+                return window.MediaKeySession.prototype[ fnname ].apply( this._session, arguments );
+            }
+        } );
+
+        MediaKeySession.prototype._onKeyStatusesChange = _proxyKeyStatusesChange;
+
+        // MediaKeyStatusMap proxy
+        //
+        // We need a proxy class to replace the broken MediaKeyStatusMap one. We cannot use a
+        // regular Map directly because we need get and has methods to compare by value not
+        // as references.
+        function MediaKeyStatusMap() { this._map = new Map(); }
+
+        Object.defineProperties( MediaKeyStatusMap.prototype, {
+            size:               { get: function() { return this._map.size; } },
+            forEach:            { get: function() { return function( f ) { return this._map.forEach( f ); } } },
+            entries:            { get: function() { return function() { return this._map.entries(); } } },
+            values:             { get: function() { return function() { return this._map.values(); } } },
+            keys:               { get: function() { return function() { return this._map.keys(); } } },
+            clear:              { get: function() { return function() { return this._map.clear(); } } } } );
+
+        MediaKeyStatusMap.prototype[ Symbol.iterator ] = function() { return this._map[ Symbol.iterator ]() };
+
+        MediaKeyStatusMap.prototype.has = function has( keyId ) {
+            for ( var k of this._map.keys() ) { if ( arrayBufferEqual( k, keyId ) ) return true; }
+            return false;
+        };
+
+        MediaKeyStatusMap.prototype.get = function get( keyId ) {
+            for ( var k of this._map.entries() ) { if ( arrayBufferEqual( k[ 0 ], keyId ) ) return k[ 1 ]; }
+        };
+
+        MediaKeyStatusMap.prototype._set = function _set( keyId, status ) {
+            this._map.set( new Uint8Array( keyId ), status );
+        };
+
+        function arrayBufferEqual(buf1, buf2)
+        {
+            if (buf1.byteLength !== buf2.byteLength) return false;
+            var a1 = Array.from( new Int8Array(buf1) ), a2 = Array.from( new Int8Array(buf2) );
+            return a1.every( function( x, i ) { return x === a2[i]; } );
+        }
+
+        // EventTarget
+        function EventTarget(){
+            this.listeners = {};
+        };
+
+        EventTarget.prototype.listeners = null;
+
+        EventTarget.prototype.addEventListener = function(type, callback){
+            if(!(type in this.listeners)) {
+                this.listeners[type] = [];
+            }
+            this.listeners[type].push(callback);
+        };
+
+        EventTarget.prototype.removeEventListener = function(type, callback){
+            if(!(type in this.listeners)) {
+                return;
+            }
+            var stack = this.listeners[type];
+            for(var i = 0, l = stack.length; i < l; i++){
+                if(stack[i] === callback){
+                    stack.splice(i, 1);
+                    return this.removeEventListener(type, callback);
+                }
+            }
+        };
+
+        EventTarget.prototype.dispatchEvent = function(event){
+            if(!(event.type in this.listeners)) {
+                return;
+            }
+            var stack = this.listeners[event.type];
+            event.target = this;
+            for(var i = 0, l = stack.length; i < l; i++) {
+                stack[i].call(this, event);
+            }
+        };
+    }
+})();
diff --git a/testing/web-platform/tests/encrypted-media/polyfill/edge-persistent-usage-record.js b/testing/web-platform/tests/encrypted-media/polyfill/edge-persistent-usage-record.js
new file mode 100644
index 000000000..7f86f0c05
--- /dev/null
+++ b/testing/web-platform/tests/encrypted-media/polyfill/edge-persistent-usage-record.js
@@ -0,0 +1,193 @@
+(function() {
+
+    // This polyfill fixes the following problems with Edge browser
+    // (1) To retrieve a persisted usage record, you must use session type 'persistent-release-message' instead of 'persistent-usage-record'
+    // (2) To retrieve a persisted usage record, you must call remove() after calling load()
+    // (3) On providing a license release acknowledgement, the session does not automatically close as is should
+    // (4) Retrieval of the usage record at the end of an active session is not supported
+
+    if ( navigator.userAgent.toLowerCase().indexOf('edge') > -1 ) {
+
+        var _mediaKeySystemAccessCreateMediaKeys = MediaKeySystemAccess.prototype.createMediaKeys;
+            _mediaKeysCreateSession = MediaKeys.prototype.createSession;
+
+        // MediaKeySession proxy
+        function MediaKeySession( mediaKeys, session )
+        {
+            EventTarget.call( this );
+
+            this._mediaKeys = mediaKeys;
+            this._session = session;
+            this._sessionId = undefined;
+            this._removing = false;
+
+            session.addEventListener( 'message', this.dispatchEvent.bind( this ) );
+            session.addEventListener( 'keystatuseschange', this.dispatchEvent.bind( this ) );
+            session.closed.then( function() { if ( !this._removing ) this._resolveClosed(); }.bind ( this ) );
+
+            this._closed = new Promise( function( resolve ) { this._resolveClosed = resolve; }.bind( this ) );
+        }
+
+        MediaKeySession.prototype = Object.create( EventTarget.prototype );
+
+        Object.defineProperties( MediaKeySession.prototype, {
+            sessionId:  { get: function() { return this._sessionId ? this._sessionId : this._session.sessionId; } },
+            expiration: { get: function() { return this._session.expiration; } },
+            closed:     { get: function() { return this._closed; } },
+            keyStatuses:{ get: function() { return this._session.keyStatuses; } }
+        });
+
+        // load()
+        //
+        // Use a surrogate 'persistent-release-message' session to obtain the release message
+        //
+        MediaKeySession.prototype.load = function load( sessionId )
+        {
+            if ( this.sessionId ) return Promise.reject( new DOMException('InvalidAccessError') );
+
+            this._surrogate = this._mediaKeys.createSession( 'persistent-release-message' );
+            this._surrogate.addEventListener( 'message', this.dispatchEvent.bind( this ) );
+
+            return this._surrogate.load( sessionId ).then( function( success ) {
+                if (!success) return false;
+
+                this._sessionId = sessionId;
+                this._removing = true;
+                this._session.close();
+
+                return this._surrogate.remove().then( function() { return true; } );
+            }.bind( this ) );
+        };
+
+        // remove()
+        //
+        // On an existing session, use a surrogate 'persistent-release-message' session to obtain the release message
+        //
+        MediaKeySession.prototype.remove = function remove()
+        {
+            if ( this._sessionId !== undefined ) return Promise.reject( new DOMException('InvalidAccessError') );
+            if ( this.sessionId === undefined ) return Promise.reject( new DOMException('InvalidAccessError') );
+
+            this._surrogate = this._mediaKeys.createSession( 'persistent-release-message' );
+            this._surrogate.addEventListener( 'message', this.dispatchEvent.bind( this ) );
+            this._removing = true;
+            this._sessionId = this._session.sessionId;
+
+            var self = this;
+
+            return Promise.all( [ self._session.close(), self._session.closed ] ).then( function() {
+                return self._surrogate.load( self._sessionId );
+            }).then( function( success ) {
+                if ( !success ) {
+                    throw new DOMException('InvalidAccessError');
+                }
+
+                return self._surrogate.remove();
+            }).then( function() { return true; } );
+        }
+
+        // update()
+        //
+        // For a normal session, pass through, otherwise update the surrogate and close the proxy
+        MediaKeySession.prototype.update = function update( message )
+        {
+            if ( !this._removing ) return this._session.update( message );
+
+            return this._surrogate.update( message ).then( function() {
+                this._sessionId = undefined;
+                this._resolveClosed();
+            }.bind( this ) );
+        };
+
+        // close() - pass through
+        //
+        MediaKeySession.prototype.close = function close()
+        {
+            if ( !this._removing ) return this._session.close();
+            this._resolveClosed();
+            return Promise.resolve();
+        };
+
+        // generateRequest() - pass through
+        //
+        MediaKeySession.prototype.generateRequest = function generateRequest( initDataType, initData )
+        {
+            if ( this.sessionId ) Promise.reject( new DOMException('InvalidAccessError') );
+            return this._session.generateRequest( initDataType, initData );
+        };
+
+        // Wrap PlayReady persistent-usage-record sessions in our Proxy
+        MediaKeys.prototype.createSession = function createSession( sessionType ) {
+
+            var session = _mediaKeysCreateSession.call( this, sessionType );
+            if ( this._keySystem !== 'com.microsoft.playready' || sessionType !== 'persistent-usage-record' )
+            {
+                return session;
+            }
+
+            return new MediaKeySession( this, session );
+
+        };
+
+        //
+        // Annotation polyfills - annotate not otherwise available data
+        //
+
+        // Annotate MediaKeys with the keysystem
+        MediaKeySystemAccess.prototype.createMediaKeys = function createMediaKeys()
+        {
+            return _mediaKeySystemAccessCreateMediaKeys.call( this ).then( function( mediaKeys ) {
+                mediaKeys._keySystem = this.keySystem;
+                return mediaKeys;
+            }.bind( this ) );
+        };
+
+        //
+        // Utilities
+        //
+
+        // Allow us to modify the target of Events
+        Object.defineProperties( Event.prototype, {
+            target: {   get: function() { return this._target || this.currentTarget; },
+                        set: function( newtarget ) { this._target = newtarget; } }
+        } );
+
+        // Make an EventTarget base class
+        function EventTarget(){
+            this.listeners = {};
+        };
+
+        EventTarget.prototype.listeners = null;
+
+        EventTarget.prototype.addEventListener = function(type, callback){
+            if(!(type in this.listeners)) {
+            this.listeners[type] = [];
+            }
+            this.listeners[type].push(callback);
+        };
+
+        EventTarget.prototype.removeEventListener = function(type, callback){
+            if(!(type in this.listeners)) {
+                return;
+            }
+            var stack = this.listeners[type];
+            for(var i = 0, l = stack.length; i < l; i++){
+                if(stack[i] === callback){
+                    stack.splice(i, 1);
+                    return this.removeEventListener(type, callback);
+                }
+            }
+        };
+
+        EventTarget.prototype.dispatchEvent = function(event){
+            if(!(event.type in this.listeners)) {
+                return;
+            }
+            var stack = this.listeners[event.type];
+            event.target = this;
+            for(var i = 0, l = stack.length; i < l; i++) {
+                stack[i].call(this, event);
+            }
+        };
+    }
+})();
diff --git a/testing/web-platform/tests/encrypted-media/polyfill/firefox-polyfill.js b/testing/web-platform/tests/encrypted-media/polyfill/firefox-polyfill.js
new file mode 100644
index 000000000..ce241af36
--- /dev/null
+++ b/testing/web-platform/tests/encrypted-media/polyfill/firefox-polyfill.js
@@ -0,0 +1,23 @@
+(function(){
+    if(navigator.userAgent.toLowerCase().indexOf('firefox') > -1){
+
+        // Work around https://bugzilla.mozilla.org/show_bug.cgi?id=1282142
+        // Firefox does not correctly reject the Clear Key session types it does not support
+        var _requestMediaKeySystemAccess = navigator.requestMediaKeySystemAccess.bind( navigator );
+
+        navigator.requestMediaKeySystemAccess = function( keysystem, configurations )
+        {
+            if ( keysystem !== 'org.w3.clearkey' ) return _requestMediaKeySystemAccess( keysystem, configurations );
+
+            var supported_configurations = configurations.filter( function( c ) {
+
+                return !c.sessionTypes || ( c.sessionTypes.length === 1 && c.sessionTypes[ 0 ] === 'temporary' );
+
+            } );
+
+            if ( supported_configurations.length === 0 ) return Promise.reject( new DOMException( 'None of the requested configurations were supported.' ) );
+
+            return _requestMediaKeySystemAccess( keysystem, supported_configurations );
+        }
+    }
+}());
\ No newline at end of file
diff --git a/testing/web-platform/tests/encrypted-media/polyfill/make-polyfill-tests.py b/testing/web-platform/tests/encrypted-media/polyfill/make-polyfill-tests.py
new file mode 100644
index 000000000..b4248569a
--- /dev/null
+++ b/testing/web-platform/tests/encrypted-media/polyfill/make-polyfill-tests.py
@@ -0,0 +1,29 @@
+#!/usr/bin/python
+import os, re, os.path, glob
+
+head = re.compile( r"^(\s*</head>)", re.MULTILINE )
+runtest = re.compile( r"runTest\(\s*(\S.*?)\s*\)", re.DOTALL )
+
+scripts = '''
+    <!-- Polyfill files (NOTE: These are added by auto-generation script) -->
+    <script src=/encrypted-media/polyfill/chrome-polyfill.js></script>
+    <script src=/encrypted-media/polyfill/firefox-polyfill.js></script>
+    <script src=/encrypted-media/polyfill/edge-persistent-usage-record.js></script>
+    <script src=/encrypted-media/polyfill/edge-keystatuses.js></script>
+    <script src=/encrypted-media/polyfill/clearkey-polyfill.js></script>'''
+
+def process_file( infile, outfile ) :
+    with open( outfile, "w" ) as output :
+        with open( infile, "r" ) as input :
+            output.write( runtest.sub( r"runTest( \1, 'polyfill: ' )", head.sub( scripts + r"\1", input.read() ) ) )
+
+if __name__ == '__main__' :
+    if (not os.getcwd().endswith('polyfill')) :
+        print "Please run from polyfill directory"
+        exit( 1 )
+
+    for infile in glob.glob( "../*.html" ) :
+        process_file( infile, os.path.basename( infile ) )
+
+    for infile in glob.glob( "../resources/*.html" ) :
+        process_file( infile, os.path.join( "resources", os.path.basename( infile ) ) )
\ No newline at end of file