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

content/browser/renderer_host/media/media_stream_manager.cc

 // 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.
 
 #include "content/browser/renderer_host/media/media_stream_manager.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 445 matching lines @@
   DCHECK(audio_input_device_manager_.get());
   return audio_input_device_manager_.get();
 }
 
 MediaDevicesManager* MediaStreamManager::media_devices_manager() {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   // nullptr might be returned during shutdown.
   return media_devices_manager_.get();
 }
 
+media::AudioSystem* MediaStreamManager::audio_system() {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  return audio_system_;
+}
+
 void MediaStreamManager::AddVideoCaptureObserver(
     media::VideoCaptureObserver* capture_observer) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   if (video_capture_manager_) {
     video_capture_manager_->AddVideoCaptureObserver(capture_observer);
   }
 }
 
 void MediaStreamManager::RemoveAllVideoCaptureObservers() {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
@@ skipping 1297 matching lines @@
     request->ui_proxy->OnStarted(
         base::Bind(&MediaStreamManager::StopMediaStreamFromBrowser,
                    base::Unretained(this), label),
         base::Bind(&MediaStreamManager::OnMediaStreamUIWindowId,
                    base::Unretained(this), request->video_type(),
                    request->devices));
   }
 }
 
 }  // namespace content