Add mojo interface+impl for audio stream control.

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 "gpu/ipc/common/mailbox_holder.mojom";
 import "mojo/common/time.mojom";
 import "ui/gfx/geometry/mojo/geometry.mojom";
 
 // See media/base/buffering_state.h for descriptions.
 [Native]
 enum BufferingState;
 
 // See media/base/decode_status.h for descriptions.
 [Native]
 enum DecodeStatus;
 
 // See media/base/audio_codecs.h for descriptions.
 [Native]
 enum AudioCodec;
 
 // See media/base/channel_layout.h for descriptions.
 [Native]
 enum ChannelLayout;
 
+// See media/base/output_device_info.h for descriptions.
+[Native]
+enum OutputDeviceStatus;
+
 // See media/base/sample_format.h for descriptions.
 [Native]
 enum SampleFormat;
 
 // See media/base/video_types.h for descriptions.
 [Native]
 enum VideoPixelFormat;
 
 // See media/base/video_types.h for descriptions.
 [Native]
@@ skipping 173 matching lines @@
 };
 
 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;
 };