Host-side implementation of ARC audio bridge.

components/arc/audio/arc_audio_bridge.h

Index: components/arc/audio/arc_audio_bridge.h
diff --git a/components/arc/audio/arc_audio_bridge.h b/components/arc/audio/arc_audio_bridge.h
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+++ b/components/arc/audio/arc_audio_bridge.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 COMPONENTS_ARC_AUDIO_ARC_AUDIO_BRIDGE_H_
+#define COMPONENTS_ARC_AUDIO_ARC_AUDIO_BRIDGE_H_
+
+#include <string>
+
+#include "base/macros.h"
+#include "chromeos/audio/cras_audio_handler.h"
+#include "components/arc/arc_bridge_service.h"
+#include "components/arc/arc_service.h"
+#include "mojo/public/cpp/bindings/binding.h"
+
+namespace arc {
+
+class ArcAudioBridge : public ArcService,
+                       public ArcBridgeService::Observer,
+                       public chromeos::CrasAudioHandler::AudioObserver {
+ public:
+  explicit ArcAudioBridge(ArcBridgeService* bridge_service);
+  ~ArcAudioBridge() override;
+
+  // ArcBridgeService::Observer overrides.
+  void OnAudioInstanceReady() override;
+
+ private:
+  chromeos::CrasAudioHandler* cras_audio_handler_ = nullptr;
+
+  // chromeos::CrasAudioHandler::AudioObserver overrides.
+  void OnAudioNodesChanged() override;
+
+  void SendSwitchState(bool headphone_inserted, bool microphone_inserted);
+
+  DISALLOW_COPY_AND_ASSIGN(ArcAudioBridge);
+};
+
+}  // namespace arc
+
+#endif  // COMPONENTS_ARC_AUDIO_ARC_AUDIO_BRIDGE_H_