Expose MEDIA_STATISTICS stats to chrome://media-internals.

Introduce MEDIA_STATISTICS parameters, such as decodedVideoFrameCount and friends, to chrome://media-internals properties.

BUG=178563

Review URL: https://chromiumcodereview.appspot.com/13870004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@195111 0039d316-1c4b-4281-b951-d872f2087c98

media/base/media_log.cc

@@ -56,6 +56,8 @@ const char* MediaLog::EventTypeToString(MediaLogEvent::Type type) {
       return "BUFFERED_EXTENTS_CHANGED";
     case MediaLogEvent::MEDIA_SOURCE_ERROR:
       return "MEDIA_SOURCE_ERROR";
+    case MediaLogEvent::PIPELINE_STATISTICS_CHANGED:
+      return "PIPELINE_STATISTICS_CHANGED";
   }
   NOTREACHED();
   return NULL;
@@ -196,4 +198,14 @@ scoped_ptr<MediaLogEvent> MediaLog::CreateMediaSourceErrorEvent(
   return event.Pass();
 }
 
+scoped_ptr<MediaLogEvent> MediaLog::CreatePipelineStatisticsChangedEvent(
+    const PipelineStatistics& stats) {
+  scoped_ptr<MediaLogEvent> event(
+      CreateEvent(MediaLogEvent::PIPELINE_STATISTICS_CHANGED));
+  event->params.SetInteger("decoded_audio_bytes", stats.audio_bytes_decoded);
+  event->params.SetInteger("decoded_video_bytes", stats.video_bytes_decoded);
+  event->params.SetInteger("decoded_video_frames", stats.video_frames_decoded);
+  event->params.SetInteger("dropped_video_frames", stats.video_frames_dropped);
+  return event.Pass();
+}
 }  //namespace media

media/base/media_log.h

@@ -67,6 +67,8 @@ class MEDIA_EXPORT MediaLog : public base::RefCountedThreadSafe<MediaLog> {
       size_t start, size_t current, size_t end);
   scoped_ptr<MediaLogEvent> CreateMediaSourceErrorEvent(
       const std::string& error);
+  scoped_ptr<MediaLogEvent> CreatePipelineStatisticsChangedEvent(
+      const PipelineStatistics& stats);
 
  protected:
   friend class base::RefCountedThreadSafe<MediaLog>;

media/base/media_log_event.h

@@ -72,6 +72,13 @@ struct MediaLogEvent {
     // Errors reported by Media Source Extensions code.
     MEDIA_SOURCE_ERROR,
     // params: "error": Error string describing the error detected.
+
+   // Statistics for pipeline.
+   // params: "decoded_audio_bytes": <decoded audio bytes of the video>
+   //         "decoded_video_bytes": <decoded video bytes of the video>
+   //         "decoded_video_frames": <decoded video frames of the video>
+   //         "dropped_video_frames": <dropped video frames of the video>
+   PIPELINE_STATISTICS_CHANGED,
   };
 
   int32 id;

media/base/pipeline.cc

@@ -720,6 +720,8 @@ void Pipeline::OnUpdateStatistics(const PipelineStatistics& stats) {
   statistics_.video_bytes_decoded += stats.video_bytes_decoded;
   statistics_.video_frames_decoded += stats.video_frames_decoded;
   statistics_.video_frames_dropped += stats.video_frames_dropped;
+  media_log_->AddEvent(
+      media_log_->CreatePipelineStatisticsChangedEvent(statistics_));
 }
 
 void Pipeline::StartTask(scoped_ptr<FilterCollection> filter_collection,