Pause autoplay muted video when unmuting if there's no user gesture

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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 2265 matching lines @@
 
 bool HTMLMediaElement::muted() const
 {
     return m_muted;
 }
 
 void HTMLMediaElement::setMuted(bool muted)
 {
     DVLOG(MEDIA_LOG_LEVEL) << "setMuted(" << (void*)this << ", " << boolString(muted) << ")";
 
+    if (UserGestureIndicator::processingUserGesture())
+        unlockUserGesture();
+
     if (m_muted == muted)
         return;
 
     m_muted = muted;
     m_autoplayHelper->mutedChanged();
 
     updateVolume();
 
     if (muted)
         Platform::current()->recordAction(UserMetricsAction("Media_Playback_Mute_On"));
     else
         Platform::current()->recordAction(UserMetricsAction("Media_Playback_Mute_Off"));
 
     scheduleEvent(EventTypeNames::volumechange);
+
+    // Pause the element when unmuting if it's still locked.
+    if (!muted && isGestureNeededForPlayback())
+        pause();
 }
 
 void HTMLMediaElement::updateVolume()
 {
     if (webMediaPlayer())
         webMediaPlayer()->setVolume(effectiveMediaVolume());
 
     if (mediaControls())
         mediaControls()->updateVolume();
 }
@@ skipping 1659 matching lines @@
 
 IntRect HTMLMediaElement::AutoplayHelperClientImpl::absoluteBoundingBoxRect() const
 {
     IntRect result;
     if (LayoutObject* object = m_element->layoutObject())
         result = object->absoluteBoundingBoxRect();
     return result;
 }
 
 } // namespace blink