Add ability to retrieve capabilities for audio input devices to MediaDevicesDispatcherHost.

content/browser/renderer_host/media/media_stream_manager.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.
 
 // MediaStreamManager is used to open media capture devices (video supported
 // now). Call flow:
 // 1. GenerateStream is called when a render process wants to use a capture
 //    device.
 // 2. MediaStreamManager will ask MediaStreamUIController for permission to
 //    use devices and for which device to use.
@@ skipping 87 matching lines @@
 
   // Used to access VideoCaptureManager.
   VideoCaptureManager* video_capture_manager();
 
   // Used to access AudioInputDeviceManager.
   AudioInputDeviceManager* audio_input_device_manager();
 
   // Used to access MediaDevicesManager.
   MediaDevicesManager* media_devices_manager();
 
+  // Used to access AudioSystem.
+  media::AudioSystem* audio_system();
+
   // AddVideoCaptureObserver() and RemoveAllVideoCaptureObservers() must be
   // called after InitializeDeviceManagersOnIOThread() and before
   // WillDestroyCurrentMessageLoop(). They can be called more than once and it's
   // ok to not call at all if the client is not interested in receiving
   // media::VideoCaptureObserver callbacks.
   // The methods must be called on BrowserThread::IO threads. The callbacks of
   // media::VideoCaptureObserver also arrive on BrowserThread::IO threads.
   void AddVideoCaptureObserver(media::VideoCaptureObserver* capture_observer);
   void RemoveAllVideoCaptureObservers();
 
@@ skipping 306 matching lines @@
   std::map<int, base::Callback<void(const std::string&)>> log_callbacks_;
 
   GenerateStreamTestCallback generate_stream_test_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaStreamManager);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_MEDIA_STREAM_MANAGER_H_