Remove AudioDecoder from the Filter heirarchy.

media/base/pipeline_status.h

Index: media/base/pipeline_status.h
diff --git a/media/base/pipeline_status.h b/media/base/pipeline_status.h
index e8648c3a16fe9ba6f264891d6f4b8b15548abc38..aba9bf7678fe1986ddb4212bbda456772cb35a01 100644
--- a/media/base/pipeline_status.h
+++ b/media/base/pipeline_status.h
@@ -37,6 +37,24 @@ enum PipelineStatus {
 
 typedef base::Callback<void(PipelineStatus)> PipelineStatusCB;
 
+// TODO(scherkus): this should be moved alongside host interface definitions.
+struct PipelineStatistics {
+  PipelineStatistics()
+      : audio_bytes_decoded(0),
+        video_bytes_decoded(0),
+        video_frames_decoded(0),
+        video_frames_dropped(0) {
+  }
+
+  uint32 audio_bytes_decoded;  // Should be uint64?
+  uint32 video_bytes_decoded;  // Should be uint64?
+  uint32 video_frames_decoded;
+  uint32 video_frames_dropped;
+};
+
+// Used for updating pipeline statistics.
+typedef base::Callback<void(const PipelineStatistics&)> StatisticsCallback;
+
 }  // namespace media
 
 #endif  // MEDIA_BASE_PIPELINE_STATUS_H_