Detect change on the intersection of video and viewport.

third_party/WebKit/Source/core/html/HTMLMediaElement.h

 /*
  * 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 294 matching lines @@
   void notifyPositionMayHaveChanged(const IntRect&);
   void updatePositionNotificationRegistration();
 
   WebRemotePlaybackClient* remotePlaybackClient() {
     return m_remotePlaybackClient;
   }
   const WebRemotePlaybackClient* remotePlaybackClient() const {
     return m_remotePlaybackClient;
   }
 
+  WebMediaPlayer::ViewportIntersectionInfo currentViewportIntersection() const {
+    return m_currentViewportIntersection;
+  }
+
  protected:
   HTMLMediaElement(const QualifiedName&, Document&);
   ~HTMLMediaElement() override;
   void dispose();
 
   void parseAttribute(const QualifiedName&,
                       const AtomicString&,
                       const AtomicString&) override;
   void finishParsingChildren() final;
   bool isURLAttribute(const Attribute&) const override;
@@ skipping 399 matching lines @@
 
   Member<AutoplayExperimentHelper::Client> m_autoplayHelperClient;
   Member<AutoplayExperimentHelper> m_autoplayHelper;
   Member<AutoplayUmaHelper> m_autoplayUmaHelper;
 
   WebRemotePlaybackClient* m_remotePlaybackClient;
 
   // class AutoplayVisibilityObserver;
   Member<ElementVisibilityObserver> m_autoplayVisibilityObserver;
 
+  WebMediaPlayer::ViewportIntersectionInfo m_currentViewportIntersection;
+
   static URLRegistry* s_mediaStreamRegistry;
 };
 
 inline bool isHTMLMediaElement(const HTMLElement& element) {
   return isHTMLAudioElement(element) || isHTMLVideoElement(element);
 }
 
 DEFINE_HTMLELEMENT_TYPE_CASTS_WITH_FUNCTION(HTMLMediaElement);
 
 }  // namespace blink
 
 #endif  // HTMLMediaElement_h