[Blink>Media] Add heuristic for dominant video detection for Android

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

 /*
  * Copyright (C) 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All rights
  * reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 385 matching lines @@
   bool hasSelectedVideoTrack() final;
   WebMediaPlayer::TrackId getSelectedVideoTrackId() final;
   bool isAutoplayingMuted() final;
   void requestReload(const WebURL&) final;
   void activateViewportIntersectionMonitoring(bool) final;
 
   void loadTimerFired(TimerBase*);
   void progressEventTimerFired(TimerBase*);
   void playbackProgressTimerFired(TimerBase*);
   void checkViewportIntersectionTimerFired(TimerBase*);
+  static bool computeIsMostlyFillingViewport(const IntRect& targetRect,
+                                             const IntRect& rootRect,
+                                             const IntRect& intersectionRect);
   void startPlaybackProgressTimer();
   void startProgressEventTimer();
   void stopPeriodicTimers();
 
   void seek(double time);
   void finishSeek();
   void checkIfSeekNeeded();
   void addPlayedRange(double start, double end);
 
   // FIXME: Rename to scheduleNamedEvent for clarity.
@@ skipping 336 matching lines @@
 
 inline bool isHTMLMediaElement(const HTMLElement& element) {
   return isHTMLAudioElement(element) || isHTMLVideoElement(element);
 }
 
 DEFINE_HTMLELEMENT_TYPE_CASTS_WITH_FUNCTION(HTMLMediaElement);
 
 }  // namespace blink
 
 #endif  // HTMLMediaElement_h