Simplify ElementVisibilityObserver implementation.

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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 12 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef HTMLMediaElement_h
 #define HTMLMediaElement_h
 
 #include "bindings/core/v8/ActiveScriptWrappable.h"
 #include "bindings/core/v8/ScriptPromise.h"
 #include "core/CoreExport.h"
 #include "core/dom/ActiveDOMObject.h"
+#include "core/dom/ElementVisibilityObserver.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/events/GenericEventQueue.h"
 #include "core/html/AutoplayExperimentHelper.h"
 #include "core/html/HTMLElement.h"
 #include "core/html/track/TextTrack.h"
 #include "platform/Supplementable.h"
 #include "platform/audio/AudioSourceProvider.h"
 #include "public/platform/WebAudioSourceProviderClient.h"
 #include "public/platform/WebMediaPlayerClient.h"
 #include "public/platform/WebMimeRegistry.h"
@@ skipping 20 matching lines @@
 class TextTrackContainer;
 class TextTrackList;
 class TimeRanges;
 class URLRegistry;
 class VideoTrackList;
 class WebAudioSourceProvider;
 class WebInbandTextTrack;
 class WebLayer;
 class WebRemotePlaybackClient;
 
-class CORE_EXPORT HTMLMediaElement : public HTMLElement, public Supplementable<HTMLMediaElement>, public ActiveScriptWrappable, public ActiveDOMObject, private WebMediaPlayerClient {
+class CORE_EXPORT HTMLMediaElement : public HTMLElement, public Supplementable<HTMLMediaElement>, public ActiveScriptWrappable, public ActiveDOMObject, private WebMediaPlayerClient, private ElementVisibilityObserver::Client {
     DEFINE_WRAPPERTYPEINFO();
     USING_GARBAGE_COLLECTED_MIXIN(HTMLMediaElement);
     USING_PRE_FINALIZER(HTMLMediaElement, dispose);
 public:
     static WebMimeRegistry::SupportsType supportsType(const ContentType&);
 
     enum class RecordMetricsBehavior {
         DoNotRecord,
         DoRecord
     };
@@ skipping 411 matching lines @@
     void resolveScheduledPlayPromises();
     void rejectScheduledPlayPromises();
     void rejectPlayPromises(ExceptionCode, const String&);
     void rejectPlayPromisesInternal(ExceptionCode, const String&);
 
     EnumerationHistogram& showControlsHistogram() const;
 
     void recordAutoplaySourceMetric(int source);
     void recordAutoplayUnmuteStatus(AutoplayUnmuteActionStatus);
 
-    void onVisibilityChangedForAutoplay(bool isVisible);
+    // ElementVisibilityObserver::Client implementation
+    void onVisibilityChanged(bool isVisible) override;
+    ExecutionContext* getElementVisibilityExecutionContext() const override { return getExecutionContext(); }
 
     UnthrottledTimer<HTMLMediaElement> m_loadTimer;
     UnthrottledTimer<HTMLMediaElement> m_progressEventTimer;
     UnthrottledTimer<HTMLMediaElement> m_playbackProgressTimer;
     UnthrottledTimer<HTMLMediaElement> m_audioTracksTimer;
     Member<TimeRanges> m_playedTimeRanges;
     Member<GenericEventQueue> m_asyncEventQueue;
 
     double m_playbackRate;
     double m_defaultPlaybackRate;
@@ skipping 174 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