Move the device enumerate/open/close work to device thread from IO thread

content/browser/renderer_host/media/audio_input_renderer_host.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/audio_input_renderer_host.h"
 
 #include "base/bind.h"
 #include "base/metrics/histogram.h"
 #include "base/process.h"
 #include "base/shared_memory.h"
@@ skipping 167 matching lines @@
 
   return handled;
 }
 void AudioInputRendererHost::OnStartDevice(int stream_id, int session_id) {
   VLOG(1) << "AudioInputRendererHost::OnStartDevice(stream_id="
           << stream_id << ", session_id = " << session_id << ")";
 
   // Get access to the AudioInputDeviceManager to start the device.
   media_stream::AudioInputDeviceManager* audio_input_man =
       media_stream::MediaStreamManager::GetForResourceContext(
-          resource_context_, audio_manager_)->audio_input_device_manager();
+          resource_context_)->audio_input_device_manager();
 
   // Add the session entry to the map.
   session_entries_[session_id] = stream_id;
 
   // Start the device with the session_id. If the device is started
   // successfully, OnDeviceStarted() callback will be triggered.
   audio_input_man->Start(session_id, this);
 }
 
 void AudioInputRendererHost::OnCreateStream(
@@ skipping 145 matching lines @@
 
   // Delete the session entry.
   session_entries_.erase(it);
 }
 
 void AudioInputRendererHost::StopAndDeleteDevice(int session_id) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 
   media_stream::AudioInputDeviceManager* audio_input_man =
       media_stream::MediaStreamManager::GetForResourceContext(
-          resource_context_, audio_manager_)->audio_input_device_manager();
+          resource_context_)->audio_input_device_manager();
   audio_input_man->Stop(session_id);
 
   // Delete the session entry.
   session_entries_.erase(session_id);
 }
 
 void AudioInputRendererHost::CloseAndDeleteStream(AudioEntry* entry) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 
   if (!entry->pending_close) {
@@ skipping 50 matching lines @@
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 
   for (SessionEntryMap::iterator it = session_entries_.begin();
        it != session_entries_.end(); ++it) {
     if (stream_id == it->second) {
       return it->first;
     }
   }
   return 0;
 }