Enable renderer side mixing behind a flag.

content/renderer/render_thread_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.
 
 #include "content/renderer/render_thread_impl.h"
 
 #include <algorithm>
 #include <limits>
 #include <map>
 #include <vector>
@@ skipping 37 matching lines @@
 #include "content/public/renderer/render_process_observer.h"
 #include "content/public/renderer/render_view_visitor.h"
 #include "content/renderer/browser_plugin/old/browser_plugin_channel_manager.h"
 #include "content/renderer/browser_plugin/old/browser_plugin_registry.h"
 #include "content/renderer/devtools_agent_filter.h"
 #include "content/renderer/dom_storage/dom_storage_dispatcher.h"
 #include "content/renderer/dom_storage/webstoragearea_impl.h"
 #include "content/renderer/dom_storage/webstoragenamespace_impl.h"
 #include "content/renderer/gpu/compositor_thread.h"
 #include "content/renderer/gpu/gpu_benchmarking_extension.h"
+#include "content/renderer/media/audio_hardware.h"
 #include "content/renderer/media/audio_input_message_filter.h"
 #include "content/renderer/media/audio_message_filter.h"
+#include "content/renderer/media/audio_renderer_mixer_manager.h"
 #include "content/renderer/media/media_stream_center.h"
 #include "content/renderer/media/video_capture_impl_manager.h"
 #include "content/renderer/media/video_capture_message_filter.h"
 #include "content/renderer/plugin_channel_host.h"
 #include "content/renderer/render_process_impl.h"
 #include "content/renderer/render_view_impl.h"
 #include "content/renderer/renderer_webkitplatformsupport_impl.h"
 #include "grit/content_resources.h"
 #include "ipc/ipc_channel_handle.h"
 #include "ipc/ipc_platform_file.h"
@@ skipping 34 matching lines @@
 #endif
 
 using WebKit::WebDocument;
 using WebKit::WebFrame;
 using WebKit::WebNetworkStateNotifier;
 using WebKit::WebRuntimeFeatures;
 using WebKit::WebScriptController;
 using WebKit::WebSecurityPolicy;
 using WebKit::WebString;
 using WebKit::WebView;
+using content::AudioRendererMixerManager;
 using content::RenderProcessObserver;
 
 namespace {
 
 const int64 kInitialIdleHandlerDelayMs = 1000;
 const int64 kShortIdleHandlerDelayMs = 1000;
 const int64 kLongIdleHandlerDelayMs = 30*1000;
 const int kIdleCPUUsageThresholdInPercents = 3;
 
 // Keep the global RenderThreadImpl in a TLS slot so it is impossible to access
@@ skipping 619 matching lines @@
   }
   if (!gpu_vda_context3d_.get()) {
     gpu_vda_context3d_.reset(
         WebGraphicsContext3DCommandBufferImpl::CreateOffscreenContext(
             this, WebKit::WebGraphicsContext3D::Attributes(),
             GURL("chrome://gpu/RenderThreadImpl::GetGpuVDAContext3D")));
   }
   return gpu_vda_context3d_->AsWeakPtr();
 }
 
+content::AudioRendererMixerManager*
+RenderThreadImpl::GetAudioRendererMixerManager() {
+  if (!audio_renderer_mixer_manager_.get()) {
+    audio_renderer_mixer_manager_.reset(new AudioRendererMixerManager(
+        audio_hardware::GetOutputSampleRate(),
+        audio_hardware::GetOutputBufferSize()));
+  }
+
+  return audio_renderer_mixer_manager_.get();
+}
+
 #if defined(OS_WIN)
 void RenderThreadImpl::PreCacheFont(const LOGFONT& log_font) {
   Send(new ChildProcessHostMsg_PreCacheFont(log_font));
 }
 
 void RenderThreadImpl::ReleaseCachedFonts() {
   Send(new ChildProcessHostMsg_ReleaseCachedFonts());
 }
 
 #endif  // OS_WIN
@@ skipping 267 matching lines @@
 
 scoped_refptr<base::MessageLoopProxy>
 RenderThreadImpl::GetFileThreadMessageLoopProxy() {
   DCHECK(message_loop() == MessageLoop::current());
   if (!file_thread_.get()) {
     file_thread_.reset(new base::Thread("Renderer::FILE"));
     file_thread_->Start();
   }
   return file_thread_->message_loop_proxy();
 }