Added metrics for background video playback.

content/renderer/media/renderer_webmediaplayer_delegate.h

 // Copyright 2015 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 CONTENT_RENDERER_MEDIA_RENDERER_WEBMEDIAPLAYER_DELEGATE_H_
 #define CONTENT_RENDERER_MEDIA_RENDERER_WEBMEDIAPLAYER_DELEGATE_H_
 
 #include <map>
 #include <memory>
 #include <set>
 
 #include "base/id_map.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/time/default_tick_clock.h"
+#include "base/time/time.h"
 #include "base/timer/timer.h"
 #include "content/common/content_export.h"
 #include "content/public/renderer/render_frame_observer.h"
 #include "media/blink/webmediaplayer_delegate.h"
 
 namespace blink {
 class WebMediaPlayer;
 }
 
 namespace media {
@@ skipping 50 matching lines @@
                                              double multiplier);
 
   // Adds or removes a delegate from |idle_delegate_map_|. The first insertion
   // or last removal will start or stop |idle_cleanup_timer_| respectively.
   void AddIdleDelegate(int delegate_id);
   void RemoveIdleDelegate(int delegate_id);
 
   // Runs periodically to suspend idle delegates in |idle_delegate_map_|.
   void CleanupIdleDelegates();
 
+  // Setter for |is_playing_background_video_| that updates the metrics.
+  void SetIsPlayingBackgroundVideo(bool is_playing);
+
   bool has_played_media_ = false;
   IDMap<Observer> id_map_;
 
   // Tracks which delegates have entered an idle state. After some period of
   // inactivity these players will be suspended to release unused resources.
   bool idle_cleanup_running_ = false;
   std::map<int, base::TimeTicks> idle_delegate_map_;
   base::RepeatingTimer idle_cleanup_timer_;
 
   // Amount of time allowed to elapse after a delegate enters the paused before
   // the delegate is suspended.
   base::TimeDelta idle_timeout_;
 
   // The polling interval used for checking the delegates to see if any have
   // exceeded |idle_timeout_| since their last pause state.
   base::TimeDelta idle_cleanup_interval_;
 
   // Clock used for calculating when delegates have expired. May be overridden
   // for testing.
   std::unique_ptr<base::DefaultTickClock> default_tick_clock_;
   base::TickClock* tick_clock_;
 
   // If a video is playing in the background. Set when user resumes a video
   // allowing it to play and reset when either user pauses it or it goes
   // foreground.
   bool is_playing_background_video_ = false;
 
+  // Keeps track of when the background video playback started for metrics.
+  base::TimeTicks background_video_playing_start_time_;
+
   // The currently playing local videos. Used to determine whether
   // OnMediaDelegatePlay() should allow the videos to play in the background or
   // not.
   std::set<int> playing_videos_;
 
   DISALLOW_COPY_AND_ASSIGN(RendererWebMediaPlayerDelegate);
 };
 
 }  // namespace media
 
 #endif  // CONTENT_RENDERER_MEDIA_RENDERER_WEBMEDIAPLAYER_DELEGATE_H_