Add support for HTMLMediaElement::getStartDate()

public/platform/WebMediaPlayer.h

 /*
  * Copyright (C) 2009 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 18 matching lines @@
  */
 
 #ifndef WebMediaPlayer_h
 #define WebMediaPlayer_h
 
 #include "WebCanvas.h"
 #include "WebMediaSource.h"
 #include "WebString.h"
 #include "WebTimeRange.h"
 
+#include <limits>
+
 namespace blink {
 
 class WebAudioSourceProvider;
 class WebAudioSourceProviderClient;
 class WebContentDecryptionModule;
 class WebMediaPlayerClient;
 class WebString;
 class WebURL;
 struct WebRect;
 struct WebSize;
@@ skipping 67 matching lines @@
     virtual bool hasVideo() const = 0;
     virtual bool hasAudio() const = 0;
 
     // Dimension of the video.
     virtual WebSize naturalSize() const = 0;
 
     // Getters of playback state.
     virtual bool paused() const = 0;
     virtual bool seeking() const = 0;
     virtual double duration() const = 0;
+
+    // Returns the 'timeline offset' as defined in the HTML5 spec
+    // (http://www.w3.org/html/wg/drafts/html/master/embedded-content.html#timeline-offset).
+    // The function should return the number of milliseconds between the
+    // 'timeline offset' and January 1, 1970 UTC. Use base::Time::ToJsTime() for

[philipj_slow, 2014/05/06 11:13:52]

s/for/to/

+    // generate this value from Chromium code. If the content does not have a
+    // 'timeline offset' then std::numeric_limits<double>::quiet_NaN() should be returned.
+    virtual double timelineOffset() const { return std::numeric_limits<double>::quiet_NaN(); }
+
     virtual double currentTime() const = 0;
 
     // Internal states of loading and network.
     virtual NetworkState networkState() const = 0;
     virtual ReadyState readyState() const = 0;
 
     virtual bool didLoadingProgress() const = 0;
 
     virtual bool hasSingleSecurityOrigin() const = 0;
     virtual bool didPassCORSAccessCheck() const = 0;
@@ skipping 24 matching lines @@
     // Instruct WebMediaPlayer to enter/exit fullscreen.
     virtual void enterFullscreen() { }
     virtual void exitFullscreen() { }
     // Returns true if the player can enter fullscreen.
     virtual bool canEnterFullscreen() const { return false; }
 };
 
 } // namespace blink
 
 #endif