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

media/blink/webmediaplayer_impl.h

 // Copyright 2013 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 MEDIA_BLINK_WEBMEDIAPLAYER_IMPL_H_
 #define MEDIA_BLINK_WEBMEDIAPLAYER_IMPL_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 226 matching lines @@
   // (Public for testing.)
   struct PlayState {
     DelegateState delegate_state;
     bool is_idle;
     bool is_memory_reporting_enabled;
     bool is_suspended;
   };
 
  private:
   friend class WebMediaPlayerImplTest;
+  friend class WebMediaPlayerImplBackgroundBehaviorTest;
 
   void EnableOverlay();
   void DisableOverlay();
 
   void OnPipelineSuspended();
   void OnBeforePipelineResume();
   void OnPipelineResumed();
   void OnDemuxerOpened();
 
   // Pipeline::Client overrides.
@@ skipping 423 matching lines @@
 
   // Whether the pipeline is being resumed at the moment.
   bool is_pipeline_resuming_ = false;
 
   // Pipeline statistics overridden by tests.
   base::Optional<PipelineStatistics> pipeline_statistics_for_test_;
 
   // Pipeline media duration overridden by tests.
   base::Optional<base::TimeDelta> pipeline_media_duration_for_test_;
 
+  // Whether the video requires a user gesture to resume after it was paused in
+  // the background. Affects the value of ShouldPauseVideoWhenHidden().
+  bool video_locked_when_paused_when_hidden_ = false;
+
   DISALLOW_COPY_AND_ASSIGN(WebMediaPlayerImpl);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BLINK_WEBMEDIAPLAYER_IMPL_H_