Include viewport visibility checks for autoplay experiment.

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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 246 matching lines @@
     void scheduleEvent(PassRefPtrWillBeRawPtr<Event>);
     void scheduleTimeupdateEvent(bool periodicEvent);
 
     // Returns the "effective media volume" value as specified in the HTML5 spec.
     double effectiveMediaVolume() const;
 
     // Predicates also used when dispatching wrapper creation (cf. [SpecialWrapFor] IDL attribute usage.)
     virtual bool isHTMLAudioElement() const { return false; }
     virtual bool isHTMLVideoElement() const { return false; }
 
+    // Temporary callback for crbug.com/487345,402044
+    void notifyPositionMayHaveChanged();
+
 protected:
     HTMLMediaElement(const QualifiedName&, Document&);
     ~HTMLMediaElement() override;
 #if ENABLE(OILPAN)
     void dispose();
 #endif
 
     void parseAttribute(const QualifiedName&, const AtomicString&) override;
     void finishParsingChildren() final;
     bool isURLAttribute(const Attribute&) const override;
@@ skipping 177 matching lines @@
     void selectInitialTracksIfNecessary();
 
     // Return true if and only if we require a user gesture before letting
     // the media play.
     bool isUserGestureRequiredForPlay() const;
     void removeUserGestureRequirement();
     void setInitialPlayWithoutUserGestures(bool);
 
     void audioTracksTimerFired(Timer<HTMLMediaElement>*);
 
+    // For tests.
+    void triggerAutoplayViewportCheck();
+
     Timer<HTMLMediaElement> m_loadTimer;
     Timer<HTMLMediaElement> m_progressEventTimer;
     Timer<HTMLMediaElement> m_playbackProgressTimer;
     Timer<HTMLMediaElement> m_audioTracksTimer;
     PersistentWillBeMember<TimeRanges> m_playedTimeRanges;
     OwnPtrWillBeMember<GenericEventQueue> m_asyncEventQueue;
 
     double m_playbackRate;
     double m_defaultPlaybackRate;
     NetworkState m_networkState;
@@ skipping 169 matching lines @@
 inline bool isHTMLMediaElement(const HTMLElement& element)
 {
     return isHTMLAudioElement(element) || isHTMLVideoElement(element);
 }
 
 DEFINE_HTMLELEMENT_TYPE_CASTS_WITH_FUNCTION(HTMLMediaElement);
 
 } // namespace blink
 
 #endif // HTMLMediaElement_h