Added UMA metrics for MediaSourcePlayer and MediaCodecPlayer

media/base/android/media_codec_player.h

Index: media/base/android/media_codec_player.h
diff --git a/media/base/android/media_codec_player.h b/media/base/android/media_codec_player.h
index 55ce0bebe2f17912683a649015fe856eca9730d0..694076fd06d8e9d1c164db77ee19da17ece20988 100644
--- a/media/base/android/media_codec_player.h
+++ b/media/base/android/media_codec_player.h
@@ -13,6 +13,7 @@
 #include "media/base/android/demuxer_android.h"
 #include "media/base/android/media_drm_bridge.h"
 #include "media/base/android/media_player_android.h"
+#include "media/base/android/media_statistics.h"
 #include "media/base/demuxer_stream.h"
 #include "media/base/media_export.h"
 #include "media/base/time_delta_interpolator.h"
@@ -409,6 +410,10 @@ class MEDIA_EXPORT MediaCodecPlayer : public MediaPlayerAndroid,
   // on starting the playback.
   bool key_is_added_;
 
+  // Gathers and reports playback quality statistics to UMA.
+  // Use pointer to enable replacement of this object for tests.
+  scoped_ptr<MediaStatistics> media_stat_;
+
   base::WeakPtr<MediaCodecPlayer> media_weak_this_;
   // NOTE: Weak pointers must be invalidated before all other member variables.
   base::WeakPtrFactory<MediaCodecPlayer> media_weak_factory_;