[Video] MediaSession API event handlers can resume background video.

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

Index: third_party/WebKit/Source/core/html/HTMLMediaElement.h
diff --git a/third_party/WebKit/Source/core/html/HTMLMediaElement.h b/third_party/WebKit/Source/core/html/HTMLMediaElement.h
index 1b3a7d95135ecac2a6aae4dffedc9f3a5ecdfd55..01f7867524683963d062e12a846db0838e7cb0e7 100644
--- a/third_party/WebKit/Source/core/html/HTMLMediaElement.h
+++ b/third_party/WebKit/Source/core/html/HTMLMediaElement.h
@@ -393,11 +393,14 @@ class CORE_EXPORT HTMLMediaElement
   void disconnectedFromRemoteDevice() final;
   void cancelledRemotePlaybackRequest() final;
   void remotePlaybackStarted() final;
+  void wasPausedWhenBackgrounded() final;
+  void wasResumedWhenForegrounded() final;
   bool hasSelectedVideoTrack() final;
   WebMediaPlayer::TrackId getSelectedVideoTrackId() final;
   bool isAutoplayingMuted() final;
   void requestReload(const WebURL&) final;
   void activateViewportIntersectionMonitoring(bool) final;
+  bool isBackgroundVideoPlaybackUnlocked() final;
 
   void loadTimerFired(TimerBase*);
   void progressEventTimerFired(TimerBase*);
@@ -634,6 +637,7 @@ class CORE_EXPORT HTMLMediaElement
   // FIXME: HTMLMediaElement has way too many state bits.
   bool m_lockedPendingUserGesture : 1;
   bool m_lockedPendingUserGestureIfCrossOriginExperimentEnabled : 1;
+  bool m_wasLockedWhenBackgrounded : 1;
   bool m_playing : 1;
   bool m_shouldDelayLoadEvent : 1;
   bool m_haveFiredLoadedData : 1;