Decouple c/b/cros/audio from c/b/speech.

chrome/browser/chromeos/audio/audio_mixer.h

 // Copyright (c) 2012 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 CHROME_BROWSER_CHROMEOS_AUDIO_AUDIO_MIXER_H_
 #define CHROME_BROWSER_CHROMEOS_AUDIO_AUDIO_MIXER_H_
 
 #include "base/basictypes.h"
+#include "base/callback_forward.h"
 
 namespace chromeos {
 
 class AudioMixer {
  public:
   AudioMixer() {}
   virtual ~AudioMixer() {}
 
   // Initializes the connection to the device.  This must be called on the UI
   // thread; blocking tasks may take place in the background.  Note that the
   // other methods in this interface can be called before Init().
-  virtual void Init() = 0;
+  virtual void Init(const base::Closure& on_connected) = 0;
 
   // Returns the most-recently-set volume, in the range [0.0, 100.0].
   virtual double GetVolumePercent() = 0;
 
   // Sets the volume, possibly asynchronously.
   // |percent| should be in the range [0.0, 100.0].
   virtual void SetVolumePercent(double percent) = 0;
 
   // Is the device currently muted?
   virtual bool IsMuted() = 0;
@@ skipping 23 matching lines @@
   // Locks the capture mute state of the device.
   virtual void SetCaptureMuteLocked(bool locked) = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(AudioMixer);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_AUDIO_AUDIO_MIXER_H_