Update AudioRenderer API to fire changes in BufferingState.

media/base/mock_filters.h

Index: media/base/mock_filters.h
diff --git a/media/base/mock_filters.h b/media/base/mock_filters.h
index c8548b5e1ff42f8d9013fbeb757b7d5292d92116..fde42cc2453fba89bc87e4073e03349d248bd609 100644
--- a/media/base/mock_filters.h
+++ b/media/base/mock_filters.h
@@ -141,8 +141,8 @@ class MockAudioRenderer : public AudioRenderer {
   MOCK_METHOD7(Initialize, void(DemuxerStream* stream,
                                 const PipelineStatusCB& init_cb,
                                 const StatisticsCB& statistics_cb,
-                                const base::Closure& underflow_cb,
                                 const TimeCB& time_cb,
+                                const BufferingStateCB& buffering_state_cb,
                                 const base::Closure& ended_cb,
                                 const PipelineStatusCB& error_cb));
   MOCK_METHOD0(StartRendering, void());
@@ -150,7 +150,7 @@ class MockAudioRenderer : public AudioRenderer {
   MOCK_METHOD1(Flush, void(const base::Closure& callback));
   MOCK_METHOD1(Stop, void(const base::Closure& callback));
   MOCK_METHOD1(SetPlaybackRate, void(float playback_rate));
-  MOCK_METHOD2(Preroll, void(base::TimeDelta time, const PipelineStatusCB& cb));
+  MOCK_METHOD1(StartPlayingFrom, void(base::TimeDelta time));
   MOCK_METHOD1(SetVolume, void(float volume));
   MOCK_METHOD0(ResumeAfterUnderflow, void());