Add -ifsameorigin to autoplay experiment.

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 296 matching lines @@
     {
         return m_element->shouldAutoplay(RecordMetricsBehavior::DoNotRecord);
     }
     bool isHTMLVideoElement() const override { return m_element->isHTMLVideoElement(); }
     bool isHTMLAudioElement() const override { return m_element->isHTMLAudioElement(); }
 
     // Document
     bool isLegacyViewportType() override;
     PageVisibilityState pageVisibilityState() const override;
     String autoplayExperimentMode() const override;
+    LocalFrame* frame() const override { return m_element->document().frame(); }
 
     // LayoutObject
     void setRequestPositionUpdates(bool) override;
     IntRect absoluteBoundingBoxRect() const override;
 
     DEFINE_INLINE_VIRTUAL_TRACE()
     {
         visitor->trace(m_element);
         Client::trace(visitor);
     }
@@ skipping 3617 matching lines @@
 }
 
 #if !ENABLE(OILPAN)
 WeakPtr<HTMLMediaElement> HTMLMediaElement::createWeakPtr()
 {
     return m_weakPtrFactory.createWeakPtr();
 }
 #endif
 
 } // namespace blink