cros: Enable new cras audio handler by default

chromeos/audio/cras_audio_handler.h

 // 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_AUDIO_CRAS_AUDIO_HANDLER_H_
 #define CHROMEOS_AUDIO_CRAS_AUDIO_HANDLER_H_
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
@@ skipping 36 matching lines @@
 
    protected:
     AudioObserver();
     virtual ~AudioObserver();
     DISALLOW_COPY_AND_ASSIGN(AudioObserver);
   };
 
   // Sets the global instance. Must be called before any calls to Get().
   static void Initialize(scoped_refptr<AudioPrefHandler> audio_pref_handler);
 
+  // Sets the global instance for testing.
+  static void InitializeForTesting();
+
   // Destroys the global instance.
   static void Shutdown();
 
   // Returns true if the global instance is initialized.
   static bool IsInitialized();
 
   // Gets the global instance. Initialize must be called first.
   static CrasAudioHandler* Get();
 
   // Adds an audio observer.
-  void AddAudioObserver(AudioObserver* observer);
+  virtual void AddAudioObserver(AudioObserver* observer);
 
   // Removes an audio observer.
-  void RemoveAudioObserver(AudioObserver* observer);
+  virtual void RemoveAudioObserver(AudioObserver* observer);
 
   // Returns true if audio output is muted.
-  bool IsOutputMuted();
+  virtual bool IsOutputMuted();
 
   // Returns true if audio input is muted.
-  bool IsInputMuted();
+  virtual bool IsInputMuted();
 
   // Gets volume level in 0-100% range, 0 being pure silence.
-  int GetOutputVolumePercent();
+  virtual int GetOutputVolumePercent();
 
   // Returns node_id of the active output node.
-  uint64 GetActiveOutputNode() const;
+  virtual uint64 GetActiveOutputNode() const;
 
   // Returns the node_id of the active input node.
-  uint64 GetActiveInputNode() const;
+  virtual uint64 GetActiveInputNode() const;
 
   // Gets the audio devices back in |device_list|.
-  void GetAudioDevices(AudioDeviceList* device_list) const;
+  virtual void GetAudioDevices(AudioDeviceList* device_list) const;
 
-  bool GetActiveOutputDevice(AudioDevice* device) const;
+  virtual bool GetActiveOutputDevice(AudioDevice* device) const;
 
   // Whether there is alternative input/output audio device.
-  bool has_alternative_input() const { return has_alternative_input_; }
-  bool has_alternative_output() const { return has_alternative_output_; }
+  virtual bool has_alternative_input() const { return has_alternative_input_; }
+  virtual bool has_alternative_output() const {
+    return has_alternative_output_;
+  }
 
   // Sets volume level from 0-100%. If less than kMuteThresholdPercent, then
   // mutes the sound. If it was muted, and |volume_percent| is larger than
   // the threshold, then the sound is unmuted.
-  void SetOutputVolumePercent(int volume_percent);
+  virtual void SetOutputVolumePercent(int volume_percent);
 
   // Adjusts volume up (positive percentage) or down (negative percentage).
-  void AdjustOutputVolumeByPercent(int adjust_by_percent);
+  virtual void AdjustOutputVolumeByPercent(int adjust_by_percent);
 
   // Mutes or unmutes audio output device.
-  void SetOutputMute(bool mute_on);
+  virtual void SetOutputMute(bool mute_on);
 
   // Mutes or unmutes audio input device.
-  void SetInputMute(bool mute_on);
+  virtual void SetInputMute(bool mute_on);
 
   // Sets the active audio output node to the node with |node_id|.
-  void SetActiveOutputNode(uint64 node_id);
+  virtual void SetActiveOutputNode(uint64 node_id);
 
   // Sets the active audio input node to the node with |node_id|.
-  void SetActiveInputNode(uint64 node_id);
+  virtual void SetActiveInputNode(uint64 node_id);
 
- private:
+ protected:
   explicit CrasAudioHandler(scoped_refptr<AudioPrefHandler> audio_pref_handler);
   virtual ~CrasAudioHandler();
 
+  // Only used for testing.
+  CrasAudioHandler();
+
+ private:
   // Overriden from CrasAudioHandler::Observer.
   virtual void AudioClientRestarted() OVERRIDE;
   virtual void OutputVolumeChanged(int volume) OVERRIDE;
   virtual void OutputMuteChanged(bool mute_on) OVERRIDE;
   virtual void InputMuteChanged(bool mute_on) OVERRIDE;
   virtual void NodesChanged() OVERRIDE;
   virtual void ActiveOutputNodeChanged(uint64 node_id) OVERRIDE;
   virtual void ActiveInputNodeChanged(uint64 node_id) OVERRIDE;
 
   // Overriden from AudioPrefObserver.
@@ skipping 33 matching lines @@
 
   bool output_mute_locked_;
   bool input_mute_locked_;
 
   DISALLOW_COPY_AND_ASSIGN(CrasAudioHandler);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_AUDIO_CRAS_AUDIO_HANDLER_H_