Adds method to invoke platform provided audio input UI.

media/audio/audio_manager.h

 // Copyright (c) 2010 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 MEDIA_AUDIO_AUDIO_MANAGER_H_
 #define MEDIA_AUDIO_AUDIO_MANAGER_H_
 
 #include "base/basictypes.h"
 #include "base/string16.h"
 #include "media/audio/audio_parameters.h"
@@ skipping 16 matching lines @@
 
   // Returns true if the OS reports existence of audio recording devices. This
   // does not guarantee that the existing devices support all formats and
   // sample rates.
   virtual bool HasAudioInputDevices() = 0;
 
   // Returns a human readable string for the model/make of the active audio
   // input device for this computer.
   virtual string16 GetAudioInputDeviceModel() = 0;
 
+  // Returns true if the platform specific audio input settings UI is known
+  // and can be shown.
+  virtual bool CanShowAudioInputSettings() = 0;
+
+  // Opens the platform default audio input settings UI.
+  // Note: This could invoke an external application/preferences pane, so
+  // ideally must not be called from the UI thread or other time sensitive
+  // threads to avoid blocking the rest of the application.
+  virtual void ShowAudioInputSettings() = 0;
+
   // Factory for all the supported stream formats. |params| defines parameters
   // of the audio stream to be created.
   //
   // |params.sample_per_packet| is the requested buffer allocation which the
   // audio source thinks it can usually fill without blocking. Internally two
   // or three buffers are created, one will be locked for playback and one will
   // be ready to be filled in the call to AudioSourceCallback::OnMoreData().
   //
   // Returns NULL if the combination of the parameters is not supported, or if
   // we have reached some other platform specific limit.
@@ skipping 50 matching lines @@
   virtual void Cleanup() = 0;
 
  private:
   static void Destroy(void*);
 
   // Called by GetAudioManager() to create platform-specific audio manager.
   static AudioManager* CreateAudioManager();
 };
 
 #endif  // MEDIA_AUDIO_AUDIO_MANAGER_H_