Switch to using an explicit ended signal instead of time comparison.

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 345 matching lines @@
   void contextDestroyed() final;
 
   virtual void updateDisplayState() {}
 
   void setReadyState(ReadyState);
   void setNetworkState(WebMediaPlayer::NetworkState);
 
   // WebMediaPlayerClient implementation.
   void networkStateChanged() final;
   void readyStateChanged() final;
-  void timeChanged() final;
+  void timeChanged(bool) final;
   void repaint() final;
   void durationChanged() final;
   void sizeChanged() final;
   void playbackStateChanged() final;
 
   void setWebLayer(WebLayer*) final;
   WebMediaPlayer::TrackId addAudioTrack(const WebString&,
                                         WebMediaPlayerClient::AudioTrackKind,
                                         const WebString&,
                                         const WebString&,
@@ skipping 352 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