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diff --git a/testing/web-platform/tests/IndexedDB/support-promises.js b/testing/web-platform/tests/IndexedDB/support-promises.js
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+// Returns an IndexedDB database name likely to be unique to the test case.
+const databaseName = (testCase) => {
+    return 'db' + self.location.pathname + '-' + testCase.name;
+};
+
+// Creates an EventWatcher covering all the events that can be issued by
+// IndexedDB requests and transactions.
+const requestWatcher = (testCase, request) => {
+    return new EventWatcher(testCase, request,
+        ['error', 'success', 'upgradeneeded']);
+};
+
+// Migrates an IndexedDB database whose name is unique for the test case.
+//
+// newVersion must be greater than the database's current version.
+//
+// migrationCallback will be called during a versionchange transaction and will
+// be given the created database and the versionchange transaction.
+//
+// Returns a promise. If the versionchange transaction goes through, the promise
+// resolves to an IndexedDB database that must be closed by the caller. If the
+// versionchange transaction is aborted, the promise resolves to an error.
+const migrateDatabase = (testCase, newVersion, migrationCallback) => {
+    // We cannot use eventWatcher.wait_for('upgradeneeded') here, because
+    // the versionchange transaction auto-commits before the Promise's then
+    // callback gets called.
+    return new Promise((resolve, reject) => {
+        const request = indexedDB.open(databaseName(testCase), newVersion);
+        request.onupgradeneeded = testCase.step_func(event => {
+            const database = event.target.result;
+            const transaction = event.target.transaction;
+            let abortCalled = false;
+
+            // We wrap IDBTransaction.abort so we can set up the correct event
+            // listeners and expectations if the test chooses to abort the
+            // versionchange transaction.
+            const transactionAbort = transaction.abort.bind(transaction);
+            transaction.abort = () => {
+                request.onerror = event => {
+                    event.preventDefault();
+                    resolve(event);
+                };
+                request.onsuccess = () => reject(new Error(
+                    'indexedDB.open should not succeed after the ' +
+                    'versionchange transaction is aborted'));
+                transactionAbort();
+                abortCalled = true;
+            }
+
+            migrationCallback(database, transaction);
+            if (!abortCalled) {
+                request.onsuccess = null;
+                resolve(requestWatcher(testCase, request).wait_for('success'));
+            }
+        });
+        request.onerror = event => reject(event.target.error);
+        request.onsuccess = () => reject(new Error(
+            'indexedDB.open should not succeed without creating a ' +
+            'versionchange transaction'));
+    }).then(event => event.target.result || event.target.error);
+};
+
+// Creates an IndexedDB database whose name is unique for the test case.
+//
+// setupCallback will be called during a versionchange transaction, and will be
+// given the created database and the versionchange transaction.
+//
+// Returns a promise that resolves to an IndexedDB database. The caller must
+// close the database.
+const createDatabase = (testCase, setupCallback) => {
+    const request = indexedDB.deleteDatabase(databaseName(testCase));
+    const eventWatcher = requestWatcher(testCase, request);
+
+    return eventWatcher.wait_for('success').then(event =>
+        migrateDatabase(testCase, 1, setupCallback));
+};
+
+// Opens an IndexedDB database without performing schema changes.
+//
+// The given version number must match the database's current version.
+//
+// Returns a promise that resolves to an IndexedDB database. The caller must
+// close the database.
+const openDatabase = (testCase, version) => {
+    const request = indexedDB.open(databaseName(testCase), version);
+    const eventWatcher = requestWatcher(testCase, request);
+    return eventWatcher.wait_for('success').then(
+        event => event.target.result);
+}
+
+// The data in the 'books' object store records in the first example of the
+// IndexedDB specification.
+const BOOKS_RECORD_DATA = [
+    { title: 'Quarry Memories', author: 'Fred', isbn: 123456 },
+    { title: 'Water Buffaloes', author: 'Fred', isbn: 234567 },
+    { title: 'Bedrock Nights', author: 'Barney', isbn: 345678 },
+];
+
+// Creates a 'books' object store whose contents closely resembles the first
+// example in the IndexedDB specification.
+const createBooksStore = (testCase, database) => {
+    const store = database.createObjectStore('books',
+        { keyPath: 'isbn', autoIncrement: true });
+    store.createIndex('by_author', 'author');
+    store.createIndex('by_title', 'title', { unique: true });
+    for (let record of BOOKS_RECORD_DATA)
+        store.put(record);
+    return store;
+};
+
+// Creates a 'not_books' object store used to test renaming into existing or
+// deleted store names.
+const createNotBooksStore = (testCase, database) => {
+    const store = database.createObjectStore('not_books');
+    store.createIndex('not_by_author', 'author');
+    store.createIndex('not_by_title', 'title', { unique: true });
+    return store;
+};
+
+// Verifies that an object store's indexes match the indexes used to create the
+// books store in the test database's version 1.
+//
+// The errorMessage is used if the assertions fail. It can state that the
+// IndexedDB implementation being tested is incorrect, or that the testing code
+// is using it incorrectly.
+const checkStoreIndexes = (testCase, store, errorMessage) => {
+    assert_array_equals(
+        store.indexNames, ['by_author', 'by_title'], errorMessage);
+    const authorIndex = store.index('by_author');
+    const titleIndex = store.index('by_title');
+    return Promise.all([
+        checkAuthorIndexContents(testCase, authorIndex, errorMessage),
+        checkTitleIndexContents(testCase, titleIndex, errorMessage),
+    ]);
+};
+
+// Verifies that an object store's key generator is in the same state as the
+// key generator created for the books store in the test database's version 1.
+//
+// The errorMessage is used if the assertions fail. It can state that the
+// IndexedDB implementation being tested is incorrect, or that the testing code
+// is using it incorrectly.
+const checkStoreGenerator = (testCase, store, expectedKey, errorMessage) => {
+    const request = store.put(
+        { title: 'Bedrock Nights ' + expectedKey, author: 'Barney' });
+    const eventWatcher = requestWatcher(testCase, request);
+    return eventWatcher.wait_for('success').then(() => {
+        const result = request.result;
+        assert_equals(result, expectedKey, errorMessage);
+    });
+};
+
+// Verifies that an object store's contents matches the contents used to create
+// the books store in the test database's version 1.
+//
+// The errorMessage is used if the assertions fail. It can state that the
+// IndexedDB implementation being tested is incorrect, or that the testing code
+// is using it incorrectly.
+const checkStoreContents = (testCase, store, errorMessage) => {
+    const request = store.get(123456);
+    const eventWatcher = requestWatcher(testCase, request);
+    return eventWatcher.wait_for('success').then(() => {
+        const result = request.result;
+        assert_equals(result.isbn, BOOKS_RECORD_DATA[0].isbn, errorMessage);
+        assert_equals(result.author, BOOKS_RECORD_DATA[0].author, errorMessage);
+        assert_equals(result.title, BOOKS_RECORD_DATA[0].title, errorMessage);
+    });
+};
+
+// Verifies that index matches the 'by_author' index used to create the
+// by_author books store in the test database's version 1.
+//
+// The errorMessage is used if the assertions fail. It can state that the
+// IndexedDB implementation being tested is incorrect, or that the testing code
+// is using it incorrectly.
+const checkAuthorIndexContents = (testCase, index, errorMessage) => {
+    const request = index.get(BOOKS_RECORD_DATA[2].author);
+    const eventWatcher = requestWatcher(testCase, request);
+    return eventWatcher.wait_for('success').then(() => {
+        const result = request.result;
+        assert_equals(result.isbn, BOOKS_RECORD_DATA[2].isbn, errorMessage);
+        assert_equals(result.title, BOOKS_RECORD_DATA[2].title, errorMessage);
+    });
+};
+
+// Verifies that an index matches the 'by_title' index used to create the books
+// store in the test database's version 1.
+//
+// The errorMessage is used if the assertions fail. It can state that the
+// IndexedDB implementation being tested is incorrect, or that the testing code
+// is using it incorrectly.
+const checkTitleIndexContents = (testCase, index, errorMessage) => {
+    const request = index.get(BOOKS_RECORD_DATA[2].title);
+    const eventWatcher = requestWatcher(testCase, request);
+    return eventWatcher.wait_for('success').then(() => {
+        const result = request.result;
+        assert_equals(result.isbn, BOOKS_RECORD_DATA[2].isbn, errorMessage);
+        assert_equals(result.author, BOOKS_RECORD_DATA[2].author, errorMessage);
+    });
+};