Added UMA metrics for MediaSourcePlayer and MediaCodecPlayer

media/base/android/media_codec_audio_decoder.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 MEDIA_BASE_ANDROID_MEDIA_CODEC_AUDIO_DECODER_H_
 #define MEDIA_BASE_ANDROID_MEDIA_CODEC_AUDIO_DECODER_H_
 
 #include "media/base/android/media_codec_decoder.h"
 
 namespace media {
 
 class AudioTimestampHelper;
 
 // Audio decoder for MediaCodecPlayer
 class MediaCodecAudioDecoder : public MediaCodecDecoder {
  public:
   // For parameters see media_codec_decoder.h
   // update_current_time_cb: callback that reports current playback time.
   //                         Called for each rendered frame.
   MediaCodecAudioDecoder(
       const scoped_refptr<base::SingleThreadTaskRunner>& media_runner,
       const base::Closure& request_data_cb,
       const base::Closure& starvation_cb,
       const base::Closure& decoder_drained_cb,
       const base::Closure& stop_done_cb,
       const base::Closure& key_required_cb,
       const base::Closure& error_cb,
-      const SetTimeCallback& update_current_time_cb);
+      const SetTimeCallback& update_current_time_cb,
+      FrameStatistics* frame_statistics);
   ~MediaCodecAudioDecoder() override;
 
   const char* class_name() const override;
 
   bool HasStream() const override;
   void SetDemuxerConfigs(const DemuxerConfigs& configs) override;
   bool IsContentEncrypted() const override;
   void ReleaseDecoderResources() override;
   void Flush() override;
 
@@ skipping 41 matching lines @@
 
   // Base timestamp for the |audio_timestamp_helper_|.
   base::TimeDelta base_timestamp_;
 
   // Object to calculate the current audio timestamp for A/V sync.
   scoped_ptr<AudioTimestampHelper> audio_timestamp_helper_;
 
   // Reports current playback time to the callee.
   SetTimeCallback update_current_time_cb_;
 
+  // The time limit for the next frame to avoid underrun.
+  base::TimeTicks next_frame_time_limit_;
+
   DISALLOW_COPY_AND_ASSIGN(MediaCodecAudioDecoder);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_ANDROID_MEDIA_CODEC_DECODER_H_