Include viewport visibility checks for autoplay experiment.

third_party/WebKit/Source/core/layout/LayoutMedia.cpp

 /*
  * Copyright (C) 2007, 2008, 2009, 2010 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 101 matching lines @@
     if (child->node()->isTextTrackContainer())
         return true;
 
     return false;
 }
 
 void LayoutMedia::paintReplaced(const PaintInfo&, const LayoutPoint&) const
 {
 }
 
+void LayoutMedia::willBeDestroyed()
+{
+    if (view())
+        view()->unregisterMediaForPositionChangeNotification(*this);
+    LayoutImage::willBeDestroyed();
+}
+
+void LayoutMedia::insertedIntoTree()
+{
+    LayoutImage::insertedIntoTree();
+
+    // Note that if we don't want them and aren't registered, then this
+    // will do nothing.
+    if (HTMLMediaElement* element = mediaElement())
+        element->updatePositionNotificationRegistration();
+}
+
+void LayoutMedia::notifyPositionMayHaveChanged(const IntRect& visibleRect)
+{
+    // Tell our element about it.
+    if (HTMLMediaElement* element = mediaElement())
+        element->notifyPositionMayHaveChanged(visibleRect);
+}
+
+void LayoutMedia::setRequestPositionUpdates(bool want)
+{
+    if (want)
+        view()->registerMediaForPositionChangeNotification(*this);
+    else
+        view()->unregisterMediaForPositionChangeNotification(*this);
+}
+
 } // namespace blink