Revert "Record the offscreen playing duration of autoplaying muted videos"

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

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef AutoplayUmaHelper_h
 #define AutoplayUmaHelper_h
 
 #include "core/events/EventListener.h"
 #include "platform/heap/Handle.h"
 
@@ skipping 25 matching lines @@
     static AutoplayUmaHelper* create(HTMLMediaElement*);
 
     ~AutoplayUmaHelper();
 
     bool operator==(const EventListener&) const override;
 
     void onAutoplayInitiated(AutoplaySource);
 
     void recordAutoplayUnmuteStatus(AutoplayUnmuteActionStatus);
 
+    void onVisibilityChangedForVideoMutedPlayMethod(bool isVisible);
+
     void didMoveToNewDocument(Document& oldDocument);
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
     explicit AutoplayUmaHelper(HTMLMediaElement*);
 
     void handleEvent(ExecutionContext*, Event*) override;
 
     void handlePlayingEvent();
-    void handlePauseEvent();
     void handleUnloadEvent();
 
-    void maybeUnregisterUnloadListener();
-
-    void maybeStartRecordingMutedVideoPlayMethodBecomeVisible();
-    void maybeStopRecordingMutedVideoPlayMethodBecomeVisible(bool isVisible);
-
-    void maybeStartRecordingMutedVideoOffscreenDuration();
-    void maybeStopRecordingMutedVideoOffscreenDuration();
-
-    void onVisibilityChangedForMutedVideoOffscreenDuration(bool isVisibile);
-    void onVisibilityChangedForMutedVideoPlayMethodBecomeVisible(bool isVisible);
-
-    bool shouldListenToUnloadEvent() const;
-
     // The autoplay source. Use AutoplaySource::NumberOfSources for invalid source.
     AutoplaySource m_source;
     // The media element this UMA helper is attached to. |m_element| owns |this|.
     WeakMember<HTMLMediaElement> m_element;
-
-    // The observer is used to observe whether a muted video autoplaying by play()
-    // method become visible at some point.
-    // The UMA is pending for recording as long as this observer is non-null.
-    Member<ElementVisibilityObserver> m_mutedVideoPlayMethodVisibilityObserver;
-
-    // -----------------------------------------------------------------------
-    // Variables used for recording the duration of autoplay muted video playing offscreen.
-    // The variables are valid when |m_autoplayOffscrenVisibilityObserver| is non-null.
-    // The recording stops whenever the playback pauses or the page is unloaded.
-
-    // The starting time of autoplaying muted video.
-    int64_t m_mutedVideoAutoplayOffscreenStartTimeMS;
-
-    // The duration an autoplaying muted video has been in offscreen.
-    int64_t m_mutedVideoAutoplayOffscreenDurationMS;
-
-    // Whether an autoplaying muted video is visible.
-    bool m_isVisible;
-
-    // The observer is used to observer an autoplaying muted video changing it's visibility,
-    // which is used for offscreen duration UMA.
-    // The UMA is pending for recording as long as this observer is non-null.
-    Member<ElementVisibilityObserver> m_mutedVideoOffscreenDurationVisibilityObserver;
+    // The observer is used to observe whether a muted video autoplaying by play() method become visible at some point.
+    Member<ElementVisibilityObserver> m_videoMutedPlayMethodVisibilityObserver;
 };
 
 } // namespace blink
 
 #endif // AutoplayUmaHelper_h