Add watch time metrics for HTML5 media playback.

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 54 matching lines @@
 class GLES2Interface;
 }
 }
 
 namespace media {
 class ChunkDemuxer;
 class GpuVideoAcceleratorFactories;
 class MediaLog;
 class UrlIndex;
 class VideoFrameCompositor;
+class WatchTimeReporter;
 class WebAudioSourceProviderImpl;
 class WebMediaPlayerDelegate;
 class WebTextTrackImpl;
 
 // The canonical implementation of blink::WebMediaPlayer that's backed by
 // Pipeline. Handles normal resource loading, Media Source, and
 // Encrypted Media.
 class MEDIA_BLINK_EXPORT WebMediaPlayerImpl
     : public NON_EXPORTED_BASE(blink::WebMediaPlayer),
       public NON_EXPORTED_BASE(WebMediaPlayerDelegate::Observer),
@@ skipping 257 matching lines @@
   // using for video playback.  Called by |memory_usage_reporting_timer_|.
   // Memory usage reporting is done in two steps, because |demuxer_| must be
   // accessed on the media thread.
   void ReportMemoryUsage();
   void FinishMemoryUsageReport(int64_t demuxer_memory_usage);
 
   // Called during OnHidden() when we want a suspended player to enter the
   // paused state after some idle timeout.
   void ScheduleIdlePauseTimer();
 
+  void CreateWatchTimeReporter();
+
   blink::WebLocalFrame* frame_;
 
   // The playback state last reported to |delegate_|, to avoid setting duplicate
   // states. (Which can have undesired effects like resetting the idle timer.)
   DelegateState delegate_state_;
 
   // Set when OnSuspendRequested() is called with |must_suspend| unset.
   bool is_idle_;
 
   // Set when OnSuspendRequested() is called with |must_suspend| set.
@@ skipping 166 matching lines @@
   // OnSuspendRequested() is called. If the state is UNKNOWN, the current frame
   // from the compositor will be queried to see if suspend is supported; the
   // state will be set to YES or NO respectively if a frame is available.
   enum class CanSuspendState { UNKNOWN, YES, NO };
   CanSuspendState can_suspend_state_;
 
   // Called some-time after OnHidden() if the media was suspended in a playing
   // state as part of the call to OnHidden().
   base::OneShotTimer background_pause_timer_;
 
+  // Monitors the watch time of the played content.
+  std::unique_ptr<WatchTimeReporter> watch_time_reporter_;
+  bool is_encrypted_;
+
   DISALLOW_COPY_AND_ASSIGN(WebMediaPlayerImpl);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BLINK_WEBMEDIAPLAYER_IMPL_H_