Add Audio support in Chromoting host when using WebRTC.

remoting/protocol/webrtc_audio_source_adapter.h

Index: remoting/protocol/webrtc_audio_source_adapter.h
diff --git a/remoting/protocol/webrtc_audio_source_adapter.h b/remoting/protocol/webrtc_audio_source_adapter.h
new file mode 100644
index 0000000000000000000000000000000000000000..9c488c2ae594660740ce6b31cb631b2f2b605973
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+++ b/remoting/protocol/webrtc_audio_source_adapter.h
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+// 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 REMOTING_PROTOCOL_WEBRTC_AUDIO_SOURCE_ADAPTER_H_
+#define REMOTING_PROTOCOL_WEBRTC_AUDIO_SOURCE_ADAPTER_H_
+
+#include <memory>
+
+#include "base/macros.h"
+#include "base/observer_list.h"
+#include "third_party/webrtc/api/mediastreaminterface.h"
+
+namespace webrtc {
+class AudioTrackSinkInterface;
+}  // namespace webrtc
+
+namespace remoting {
+
+class AudioPacket;
+
+namespace protocol {
+
+class AudioSource;
+
+class WebrtcAudioSourceAdapter : public webrtc::AudioSourceInterface {
+ public:
+  explicit WebrtcAudioSourceAdapter(
+      scoped_refptr<base::SingleThreadTaskRunner> audio_task_runner);
+  ~WebrtcAudioSourceAdapter() override;
+
+  void Start(std::unique_ptr<AudioSource> audio_source);
+  void Pause(bool pause);
+
+  // webrtc::AudioSourceInterface implementation.
+  SourceState state() const override;
+  bool remote() const override;
+  void RegisterAudioObserver(AudioObserver* observer) override;
+  void UnregisterAudioObserver(AudioObserver* observer) override;
+  void AddSink(webrtc::AudioTrackSinkInterface* sink) override;
+  void RemoveSink(webrtc::AudioTrackSinkInterface* sink) override;
+
+  // webrtc::NotifierInterface implementation.
+  void RegisterObserver(webrtc::ObserverInterface* observer) override;
+  void UnregisterObserver(webrtc::ObserverInterface* observer) override;
+
+ private:
+  class Core;
+
+  scoped_refptr<base::SingleThreadTaskRunner> audio_task_runner_;
+
+  // Core running on |audio_task_runner_|.
+  std::unique_ptr<Core> core_;
+
+  DISALLOW_COPY_AND_ASSIGN(WebrtcAudioSourceAdapter);
+};
+
+}  // namespace protocol
+}  // namespace remoting
+
+#endif  // REMOTING_PROTOCOL_WEBRTC_AUDIO_SOURCE_ADAPTER_H_