Add support for HTMLMediaElement::getStartDate()

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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 109 matching lines @@
 
     // ready state
     enum ReadyState { HAVE_NOTHING, HAVE_METADATA, HAVE_CURRENT_DATA, HAVE_FUTURE_DATA, HAVE_ENOUGH_DATA };
     ReadyState readyState() const;
     bool seeking() const;
 
     // playback state
     double currentTime() const;
     void setCurrentTime(double, ExceptionState&);
     double duration() const;
+    double getStartDate();
     bool paused() const;
     double defaultPlaybackRate() const;
     void setDefaultPlaybackRate(double);
     double playbackRate() const;
     void setPlaybackRate(double);
     void updatePlaybackRate();
     PassRefPtr<TimeRanges> played();
     PassRefPtr<TimeRanges> seekable() const;
     bool ended() const;
     bool autoplay() const;
@@ skipping 294 matching lines @@
     RefPtr<MediaError> m_error;
 
     double m_volume;
     double m_lastSeekTime;
 
     double m_previousProgressTime;
 
     // Cached duration to suppress duplicate events if duration unchanged.
     double m_duration;
 
+    // Holds the "timeline offset" as described in the HTML5 spec. Represents the
+    // number of seconds since January 1, 1970 or NaN if no offset is in effect.

[acolwell GONE FROM CHROMIUM, 2014/05/15 13:01:22]

s/seconds/milliseconds.

+    double m_timelineOffset;
+
     // The last time a timeupdate event was sent (wall clock).
     double m_lastTimeUpdateEventWallTime;
 
     // The last time a timeupdate event was sent in movie time.
     double m_lastTimeUpdateEventMovieTime;
 
     // Loading state.
     enum LoadState { WaitingForSource, LoadingFromSrcAttr, LoadingFromSourceElement };
     LoadState m_loadState;
     RefPtr<HTMLSourceElement> m_currentSourceNode;
@@ skipping 97 matching lines @@
 inline bool isHTMLMediaElement(const HTMLElement& element)
 {
     return isHTMLAudioElement(element) || isHTMLVideoElement(element);
 }
 
 DEFINE_HTMLELEMENT_TYPE_CASTS_WITH_FUNCTION(HTMLMediaElement);
 
 } //namespace
 
 #endif