Added UMA metrics for MediaSourcePlayer and MediaCodecPlayer

media/base/android/media_codec_audio_decoder.h

Index: media/base/android/media_codec_audio_decoder.h
diff --git a/media/base/android/media_codec_audio_decoder.h b/media/base/android/media_codec_audio_decoder.h
index 03df46b0ab1e5c4e3b1f22eb321238a8d9a5c57c..3143d560fb0ad29ec76fbc1a9de48e3f3a4aace6 100644
--- a/media/base/android/media_codec_audio_decoder.h
+++ b/media/base/android/media_codec_audio_decoder.h
@@ -19,6 +19,7 @@ class MediaCodecAudioDecoder : public MediaCodecDecoder {
   //                         Called for each rendered frame.
   MediaCodecAudioDecoder(
       const scoped_refptr<base::SingleThreadTaskRunner>& media_runner,
+      FrameStatistics* frame_statistics,
       const base::Closure& request_data_cb,
       const base::Closure& starvation_cb,
       const base::Closure& decoder_drained_cb,
@@ -87,6 +88,9 @@ class MediaCodecAudioDecoder : public MediaCodecDecoder {
   // 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);
 };