Plumb callbacks from mojo media service to client.

media/mojo/interfaces/media_types.mojom

 // Copyright 2014 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.
 
 module media.mojom;
 
 import "ui/gfx/geometry/mojo/geometry.mojom";
 
 // See media/base/buffering_state.h for descriptions.
 // Kept in sync with media::BufferingState via static_asserts.
@@ skipping 318 matching lines @@
 
   // Stride and offsets for each plane. Offsets are relative to the start
   // of |frame_data|.
   int32 y_stride;
   int32 u_stride;
   int32 v_stride;
   uint64 y_offset;
   uint64 u_offset;
   uint64 v_offset;
 };
+
+struct PipelineStatistics {
+  uint64 audio_bytes_decoded;
+  uint64 video_bytes_decoded;
+  uint32 video_frames_decoded;
+  uint32 video_frames_dropped;
+  int64 audio_memory_usage;
+  int64 video_memory_usage;
+};