Add mojo interface+impl for audio stream control.

content/browser/renderer_host/media/audio_output_delegate_impl.h

 // Copyright 2016 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.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_OUTPUT_DELEGATE_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_OUTPUT_DELEGATE_IMPL_H_
 
 #include <memory>
 #include <string>
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
-#include "content/browser/renderer_host/media/audio_output_delegate.h"
 #include "content/common/content_export.h"
+#include "media/audio/audio_output_delegate.h"
 
 namespace content {
 class AudioMirroringManager;
 class AudioSyncReader;
 class MediaObserver;
 }
 
 namespace media {
 class AudioLog;
 class AudioManager;
 class AudioOutputController;
 class AudioParameters;
 }
 
 namespace content {
 
 // This class, except for the AudioOutputDelegateImpl::EventHandler
 // implementation, is operated on the IO thread.
-class CONTENT_EXPORT AudioOutputDelegateImpl : public AudioOutputDelegate {
+class CONTENT_EXPORT AudioOutputDelegateImpl
+    : public media::AudioOutputDelegate {
  public:
-  AudioOutputDelegateImpl(AudioOutputDelegate::EventHandler* handler,
+  AudioOutputDelegateImpl(EventHandler* handler,
                           media::AudioManager* audio_manager,
                           std::unique_ptr<media::AudioLog> audio_log,
                           AudioMirroringManager* mirroring_manager,
                           MediaObserver* media_observer,
                           int stream_id,
                           int render_frame_id,
                           int render_process_id,
                           const media::AudioParameters& params,
                           const std::string& output_device_id);
 
@@ skipping 31 matching lines @@
   // and (de)register with the stream monitor when the state actually changes.
   bool playing_ = false;
   base::WeakPtrFactory<AudioOutputDelegateImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioOutputDelegateImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_OUTPUT_DELEGATE_IMPL_H_