Media Remoting: Add interstitial elements to media element shadow dom.

third_party/WebKit/Source/core/html/HTMLMediaElement.h

Index: third_party/WebKit/Source/core/html/HTMLMediaElement.h
diff --git a/third_party/WebKit/Source/core/html/HTMLMediaElement.h b/third_party/WebKit/Source/core/html/HTMLMediaElement.h
index 2bd2c77975194ae9e0914d7e2a0991d6e359151d..85bf9f780b32b50094827a136903fe894a94c11c 100644
--- a/third_party/WebKit/Source/core/html/HTMLMediaElement.h
+++ b/third_party/WebKit/Source/core/html/HTMLMediaElement.h
@@ -104,6 +104,9 @@ class CORE_EXPORT HTMLMediaElement
   // for the given document.
   static void onMediaControlsEnabledChange(Document*);
 
+  // Assert the correct order of the children in shadow dom when DCHECK is on.
+  static void assertShadowRootChildren(ShadowRoot&);

[mlamouri (slow - plz ping), 2017/04/07 13:18:32]

Could this be `protected`?

[xjz, 2017/04/07 23:07:01]

Done. Moved it to 'protected'.

+
   DECLARE_VIRTUAL_TRACE();
 
   DECLARE_VIRTUAL_TRACE_WRAPPERS();
@@ -130,6 +133,7 @@ class CORE_EXPORT HTMLMediaElement
 
   bool hasRemoteRoutes() const;
   bool isPlayingRemotely() const { return m_playingRemotely; }
+  virtual bool isMediaRemotingStarted() const { return false; }

[mlamouri (slow - plz ping), 2017/04/07 13:18:32]

Instead of making this a virtual on HTMLMediaElement, given that you use it in
only one place that checks for mediaElement.isHTMLVideoElement(), could you
simply do: `toHTMLVideoElement(mediaElement)->isMediaRemotingStarted()`?

[xjz, 2017/04/07 23:07:01]

Done.

 
   // error state
   MediaError* error() const;
@@ -560,6 +564,8 @@ class CORE_EXPORT HTMLMediaElement
 
   void viewportFillDebouncerTimerFired(TimerBase*);
 
+  virtual bool isMediaRemotingDisabled() const { return false; }
+
   TaskRunnerTimer<HTMLMediaElement> m_loadTimer;
   TaskRunnerTimer<HTMLMediaElement> m_progressEventTimer;
   TaskRunnerTimer<HTMLMediaElement> m_playbackProgressTimer;