Track intersection of HTMLMediaElement with root frame.

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 4015 matching lines @@
 }
 
 DEFINE_TRACE(HTMLMediaElement::AudioSourceProviderImpl) {
   visitor->trace(m_client);
 }
 
 void HTMLMediaElement::checkViewportIntersectionChanged() {
   // TODO(xjz): Early return if we not in tab mirroring.
 
   IntersectionGeometry geometry(
-      &document(), this, Vector<Length>(),
+      document().frame()->localFrameRoot()->document(), this, Vector<Length>(),
       IntersectionGeometry::ReportRootBounds::kShouldReportRootBounds);
   geometry.computeGeometry();
   IntRect intersectRect = geometry.intersectionIntRect();
   if (m_currentIntersectRect == intersectRect)
     return;
 
   m_currentIntersectRect = intersectRect;
   // Reset on any intersection change, since this indicates the user is
   // scrolling around in the document, the document is changing layout, etc.
   m_viewportFillDebouncerTimer.stop();
@@ skipping 14 matching lines @@
       kMostlyFillViewportBecomeStableSeconds, BLINK_FROM_HERE);
 }
 
 void HTMLMediaElement::viewportFillDebouncerTimerFired(TimerBase*) {
   m_mostlyFillingViewport = true;
   if (m_webMediaPlayer)
     m_webMediaPlayer->becameDominantVisibleContent(m_mostlyFillingViewport);
 }
 
 }  // namespace blink