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

content/browser/renderer_host/render_process_host_impl.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.
 
 // Represents the browser side of the browser <--> renderer communication
 // channel. There will be one RenderProcessHost per renderer process.
 
 #include "content/browser/renderer_host/render_process_host_impl.h"
 
 #if defined(OS_WIN)
@@ skipping 452 matching lines @@
       new RendererURLRequestContextSelector(browser_context, GetID()));
 
   channel_->AddFilter(resource_message_filter);
 #if !defined(OS_ANDROID)
   // TODO(dtrainor, klobag): Enable this when BrowserMainLoop gets
   // included in Android builds.  Tracked via 115941.
   media::AudioManager* audio_manager = BrowserMainLoop::GetAudioManager();
   channel_->AddFilter(new AudioInputRendererHost(
       resource_context, audio_manager));
   channel_->AddFilter(new AudioRendererHost(audio_manager, media_observer));
-  channel_->AddFilter(new VideoCaptureHost(resource_context, audio_manager));
+  channel_->AddFilter(new VideoCaptureHost(resource_context));
 #endif
   channel_->AddFilter(new AppCacheDispatcherHost(
       static_cast<ChromeAppCacheService*>(
           BrowserContext::GetAppCacheService(browser_context)),
       GetID()));
   channel_->AddFilter(new ClipboardMessageFilter());
   channel_->AddFilter(new DOMStorageMessageFilter(GetID(),
       static_cast<DOMStorageContextImpl*>(
           BrowserContext::GetDOMStorageContext(browser_context))));
   channel_->AddFilter(new IndexedDBDispatcherHost(GetID(),
       static_cast<IndexedDBContextImpl*>(
           BrowserContext::GetIndexedDBContext(browser_context))));
   channel_->AddFilter(GeolocationDispatcherHost::New(
       GetID(), browser_context->GetGeolocationPermissionContext()));
   gpu_message_filter_ = new GpuMessageFilter(GetID(), widget_helper_.get());
   channel_->AddFilter(gpu_message_filter_);
 #if defined(ENABLE_WEBRTC)
   channel_->AddFilter(new media_stream::MediaStreamDispatcherHost(
-      resource_context, GetID(), BrowserMainLoop::GetAudioManager()));
+      resource_context, GetID()));
 #endif
   channel_->AddFilter(
       GetContentClient()->browser()->AllowPepperPrivateFileAPI() ?
       new PepperUnsafeFileMessageFilter(GetID(), browser_context->GetPath()) :
       new PepperFileMessageFilter(GetID()));
   channel_->AddFilter(new PepperMessageFilter(PepperMessageFilter::RENDERER,
                                               GetID(), browser_context));
 #if defined(ENABLE_INPUT_SPEECH)
   channel_->AddFilter(new speech::InputTagSpeechDispatcherHost(
       GetID(), browser_context->GetRequestContext(),
@@ skipping 897 matching lines @@
       int32 route_id,
       int32 gpu_process_host_id) {
   TRACE_EVENT0("renderer_host",
                "RenderWidgetHostImpl::OnCompositorSurfaceBuffersSwappedNoHost");
   RenderWidgetHostImpl::AcknowledgeBufferPresent(route_id,
                                                  gpu_process_host_id,
                                                  0);
 }
 
 }  // namespace content