Update autoplay settings when moving media elements between documents

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 469 matching lines @@
     // doesn't get dispatched during the object destruction.
     // See Document::isDelayingLoadEvent().
     // Also see http://crbug.com/275223 for more details.
     clearMediaPlayerAndAudioSourceProviderClientWithoutLocking();
 }
 
 void HTMLMediaElement::didMoveToNewDocument(Document& oldDocument)
 {
     DVLOG(MEDIA_LOG_LEVEL) << "didMoveToNewDocument(" << (void*)this << ")";
 
+    // If any experiment is enabled, then we want to enable a user gesture by
+    // default, otherwise the experiment does nothing.
+    bool oldDocumentRequiresUserGesture = (oldDocument.settings() && oldDocument.settings()->mediaPlaybackRequiresUserGesture())
+        || m_autoplayHelper->isExperimentEnabled();
+    bool newDocumentRequiresUserGesture = (document().settings() && document().settings()->mediaPlaybackRequiresUserGesture())
+        || m_autoplayHelper->isExperimentEnabled();
+    if (newDocumentRequiresUserGesture && !oldDocumentRequiresUserGesture) {
+        m_lockedPendingUserGesture = true;
+    }
+
     if (m_shouldDelayLoadEvent) {
         document().incrementLoadEventDelayCount();
         // Note: Keeping the load event delay count increment on oldDocument that was added
         // when m_shouldDelayLoadEvent was set so that destruction of m_webMediaPlayer can not
         // cause load event dispatching in oldDocument.
     } else {
         // Incrementing the load event delay count so that destruction of m_webMediaPlayer can not
         // cause load event dispatching in oldDocument.
         oldDocument.incrementLoadEventDelayCount();
     }
@@ skipping 3381 matching lines @@
 
 IntRect HTMLMediaElement::AutoplayHelperClientImpl::absoluteBoundingBoxRect() const
 {
     IntRect result;
     if (LayoutObject* object = m_element->layoutObject())
         result = object->absoluteBoundingBoxRect();
     return result;
 }
 
 } // namespace blink