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diff --git a/chromeos/dbus/fake_cras_audio_client.h b/chromeos/dbus/fake_cras_audio_client.h
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+++ b/chromeos/dbus/fake_cras_audio_client.h
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+// Copyright (c) 2013 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 CHROMEOS_DBUS_FAKE_CRAS_AUDIO_CLIENT_H_
+#define CHROMEOS_DBUS_FAKE_CRAS_AUDIO_CLIENT_H_
+
+#include "chromeos/chromeos_export.h"
+#include "chromeos/dbus/cras_audio_client.h"
+
+namespace chromeos {
+
+class CrasAudioHandlerTest;
+
+// The CrasAudioClient implementation used on Linux desktop.
+class CHROMEOS_EXPORT FakeCrasAudioClient : public CrasAudioClient {
+ public:
+  FakeCrasAudioClient();
+  virtual ~FakeCrasAudioClient();
+
+  // CrasAudioClient overrides:
+  virtual void Init(dbus::Bus* bus) override;
+  virtual void AddObserver(Observer* observer) override;
+  virtual void RemoveObserver(Observer* observer) override;
+  virtual bool HasObserver(Observer* observer) override;
+  virtual void GetVolumeState(const GetVolumeStateCallback& callback) override;
+  virtual void GetNodes(const GetNodesCallback& callback,
+                        const ErrorCallback& error_callback) override;
+  virtual void SetOutputNodeVolume(uint64 node_id, int32 volume) override;
+  virtual void SetOutputUserMute(bool mute_on) override;
+  virtual void SetInputNodeGain(uint64 node_id, int32 gain) override;
+  virtual void SetInputMute(bool mute_on) override;
+  virtual void SetActiveOutputNode(uint64 node_id) override;
+  virtual void SetActiveInputNode(uint64 node_id) override;
+  virtual void AddActiveInputNode(uint64 node_id) override;
+  virtual void RemoveActiveInputNode(uint64 node_id) override;
+  virtual void AddActiveOutputNode(uint64 node_id) override;
+  virtual void RemoveActiveOutputNode(uint64 node_id) override;
+  virtual void SwapLeftRight(uint64 node_id, bool swap) override;
+
+  // Updates |node_list_| to contain |audio_nodes|.
+  void SetAudioNodesForTesting(const AudioNodeList& audio_nodes);
+
+  // Calls SetAudioNodesForTesting() and additionally notifies |observers_|.
+  void SetAudioNodesAndNotifyObserversForTesting(
+      const AudioNodeList& new_nodes);
+
+ private:
+  VolumeState volume_state_;
+  AudioNodeList node_list_;
+  uint64 active_input_node_id_;
+  uint64 active_output_node_id_;
+  ObserverList<Observer> observers_;
+
+  DISALLOW_COPY_AND_ASSIGN(FakeCrasAudioClient);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROMEOS_DBUS_FAKE_CRAS_AUDIO_CLIENT_H_