Detect change on video/viewport intersection when rendered remotely

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 540c9271134c84ac0359ee3f709e8c55e934a562..4eacafb934528f3ddeadcfcec473d011f3e1cc99 100644
--- a/third_party/WebKit/Source/core/html/HTMLMediaElement.h
+++ b/third_party/WebKit/Source/core/html/HTMLMediaElement.h
@@ -397,10 +397,12 @@ class CORE_EXPORT HTMLMediaElement : public HTMLElement,
   WebMediaPlayer::TrackId getSelectedVideoTrackId() final;
   bool isAutoplayingMuted() final;
   void requestReload(const WebURL&) final;
+  void enableMonitorViewportIntersection(bool) final;

[ojan, 2016/12/14 00:39:08]

I would have gone with a more generic name like "setIsRemoting" or something.
Mostly, I'm trying to find ways to have a more minimal API surface between
platform and media directories so we don't need to do plumbing for every change
we want to make.

But this is fine for now. We can rename it in the future if we find other cases
were we want to act differently based off whether the video is casting.

[xjz, 2016/12/14 00:55:05]

Yes, currently this is only used to enable monitoring changes on viewport
intersection. I agree to rename it if we have more application in future.

 
   void loadTimerFired(TimerBase*);
   void progressEventTimerFired(TimerBase*);
   void playbackProgressTimerFired(TimerBase*);
+  void checkViewportIntersectionTimerFired(TimerBase*);
   void startPlaybackProgressTimer();
   void startProgressEventTimer();
   void stopPeriodicTimers();
@@ -541,7 +543,6 @@ class CORE_EXPORT HTMLMediaElement : public HTMLElement,
 
   void onVisibilityChangedForAutoplay(bool isVisible);
 
-  void checkViewportIntersectionChanged();
   void viewportFillDebouncerTimerFired(TimerBase*);
 
   UnthrottledThreadTimer<HTMLMediaElement> m_loadTimer;
@@ -549,6 +550,7 @@ class CORE_EXPORT HTMLMediaElement : public HTMLElement,
   UnthrottledThreadTimer<HTMLMediaElement> m_playbackProgressTimer;
   UnthrottledThreadTimer<HTMLMediaElement> m_audioTracksTimer;
   UnthrottledThreadTimer<HTMLMediaElement> m_viewportFillDebouncerTimer;
+  UnthrottledThreadTimer<HTMLMediaElement> m_checkViewportIntersectionTimer;
   Member<TimeRanges> m_playedTimeRanges;
   Member<GenericEventQueue> m_asyncEventQueue;