3 files changed, 31 insertions, 0 deletions
diff --git a/netwerk/base/LoadInfo.cpp b/netwerk/base/LoadInfo.cpp
index ebe9d4703..d57f644df 100644
--- a/netwerk/base/LoadInfo.cpp
+++ b/netwerk/base/LoadInfo.cpp
@@ -67,6 +67,7 @@ LoadInfo::LoadInfo(nsIPrincipal* aLoadingPrincipal,
   , mForcePreflight(false)
   , mIsPreflight(false)
   , mLoadTriggeredFromExternal(false)
+  , mIsFromProcessingFrameAttributes(false)
 {
   MOZ_ASSERT(mLoadingPrincipal);
   MOZ_ASSERT(mTriggeringPrincipal);
@@ -241,6 +242,7 @@ LoadInfo::LoadInfo(nsPIDOMWindowOuter* aOuterWindow,
   , mForcePreflight(false)
   , mIsPreflight(false)
   , mLoadTriggeredFromExternal(false)
+  , mIsFromProcessingFrameAttributes(false)
 {
   // Top-level loads are never third-party
   // Grab the information we can out of the window.
@@ -304,6 +306,7 @@ LoadInfo::LoadInfo(const LoadInfo& rhs)
   , mForcePreflight(rhs.mForcePreflight)
   , mIsPreflight(rhs.mIsPreflight)
   , mLoadTriggeredFromExternal(rhs.mLoadTriggeredFromExternal)
+  , mIsFromProcessingFrameAttributes(rhs.mIsFromProcessingFrameAttributes)
 {
 }
 
@@ -355,6 +358,7 @@ LoadInfo::LoadInfo(nsIPrincipal* aLoadingPrincipal,
   , mForcePreflight(aForcePreflight)
   , mIsPreflight(aIsPreflight)
   , mLoadTriggeredFromExternal(aLoadTriggeredFromExternal)
+  , mIsFromProcessingFrameAttributes(false)
 {
   // Only top level TYPE_DOCUMENT loads can have a null loadingPrincipal
   MOZ_ASSERT(mLoadingPrincipal || aContentPolicyType == nsIContentPolicy::TYPE_DOCUMENT);
@@ -970,5 +974,19 @@ LoadInfo::GetIsTopLevelLoad(bool *aResult)
   return NS_OK;
 }
 
+void
+LoadInfo::SetIsFromProcessingFrameAttributes()
+{
+  mIsFromProcessingFrameAttributes = true;
+}
+
+NS_IMETHODIMP
+LoadInfo::GetIsFromProcessingFrameAttributes(bool *aIsFromProcessingFrameAttributes)
+{
+  MOZ_ASSERT(aIsFromProcessingFrameAttributes);
+  *aIsFromProcessingFrameAttributes = mIsFromProcessingFrameAttributes;
+  return NS_OK;
+}
+
 } // namespace net
 } // namespace mozilla
diff --git a/netwerk/base/LoadInfo.h b/netwerk/base/LoadInfo.h
index 2b1e8c9e8..a4ec25a9d 100644
--- a/netwerk/base/LoadInfo.h
+++ b/netwerk/base/LoadInfo.h
@@ -81,6 +81,7 @@ public:
 
   void SetIsPreflight();
   void SetUpgradeInsecureRequests();
+  void SetIsFromProcessingFrameAttributes();
 
 private:
   // private constructor that is only allowed to be called from within
@@ -157,6 +158,11 @@ private:
   bool                             mForcePreflight;
   bool                             mIsPreflight;
   bool                             mLoadTriggeredFromExternal;
+
+  // Is true if this load was triggered by processing the attributes of the
+  // browsing context container.
+  // See nsILoadInfo.isFromProcessingFrameAttributes
+  bool                             mIsFromProcessingFrameAttributes;
 };
 
 } // namespace net
diff --git a/netwerk/base/nsILoadInfo.idl b/netwerk/base/nsILoadInfo.idl
index bc609c317..fc1aadd93 100644
--- a/netwerk/base/nsILoadInfo.idl
+++ b/netwerk/base/nsILoadInfo.idl
@@ -740,4 +740,11 @@ interface nsILoadInfo : nsISupports
    * Note that the load for a sub-frame's document will return false here.
    */
   [infallible] readonly attribute boolean isTopLevelLoad;
+
+  /**
+   * This attribute will be true if this is a load triggered by
+   * https://html.spec.whatwg.org/multipage/iframe-embed-object.html#process-the-iframe-attributes
+   * or https://html.spec.whatwg.org/multipage/obsolete.html#process-the-frame-attributes
+   */
+  [infallible] readonly attribute boolean isFromProcessingFrameAttributes;
 };