Media Controls: handle 'timeupdate', 'play' and 'pause' via an EventListener.

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

 /*
  * 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 2494 matching lines @@
       pauseInternal();
     }
   }
 
   if (!m_seeking)
     scheduleTimeupdateEvent(true);
 
   if (!playbackRate())
     return;
 
-  if (!m_paused && mediaControls())

[whywhat, 2016/11/15 02:51:08]

This seems to only be called when !m_paused but scheduleTimeupdateEvent is
called if !m_seeking. Are you sure this is okay? :)

-    mediaControls()->playbackProgressed();
-
   cueTimeline().updateActiveCues(currentTime());
 }
 
 void HTMLMediaElement::scheduleTimeupdateEvent(bool periodicEvent) {
   // Per spec, consult current playback position to check for changing time.
   double mediaTime = currentPlaybackPosition();
   double now = WTF::currentTime();
 
   bool haveNotRecentlyFiredTimeupdate =
       (now - m_lastTimeUpdateEventWallTime) >= maxTimeupdateEventFrequency;
@@ skipping 791 matching lines @@
     if (!isPlaying) {
       // Set rate, muted before calling play in case they were set before the
       // media engine was setup.  The media engine should just stash the rate
       // and muted values since it isn't already playing.
       webMediaPlayer()->setRate(playbackRate());
       webMediaPlayer()->setVolume(effectiveMediaVolume());
       webMediaPlayer()->play();
       m_autoplayHelper->playbackStarted();
     }
 
-    if (mediaControls())
-      mediaControls()->playbackStarted();
     startPlaybackProgressTimer();
     m_playing = true;
-
   } else {  // Should not be playing right now
     if (isPlaying) {
       webMediaPlayer()->pause();
       m_autoplayHelper->playbackStopped();
     }
 
     m_playbackProgressTimer.stop();
     m_playing = false;
     double time = currentTime();
     if (time > m_lastSeekTime)
       addPlayedRange(m_lastSeekTime, time);
-
-    if (mediaControls())
-      mediaControls()->playbackStopped();
   }
 
   if (layoutObject())
     layoutObject()->updateFromElement();
 }
 
 void HTMLMediaElement::stopPeriodicTimers() {
   m_progressEventTimer.stop();
   m_playbackProgressTimer.stop();
 }
@@ skipping 806 matching lines @@
 
 IntRect HTMLMediaElement::AutoplayHelperClientImpl::absoluteBoundingBoxRect()
     const {
   IntRect result;
   if (LayoutObject* object = m_element->layoutObject())
     result = object->absoluteBoundingBoxRect();
   return result;
 }
 
 }  // namespace blink