Web Animations: Don't mark players as outdated upon currentTime access

Source/core/animation/Player.h

 /*
  * Copyright (C) 2013 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 101 matching lines @@
 
     RefPtr<TimedItem> m_content;
     // FIXME: We should keep the timeline alive and have this as non-null
     // but this is tricky to do without Oilpan
     DocumentTimeline* m_timeline;
     // Reflects all pausing, including via pauseForTesting().
     bool m_paused;
     bool m_held;
     bool m_isPausedForTesting;
 
-    // This indicates timing information relevant to the player has changed
+    // This indicates timing information relevant to the player has changed by
+    // means other than the ordinary progression of time
     bool m_outdated;
 };
 
 } // namespace
 
 #endif