Enable renderer side mixing behind a flag.

content/renderer/render_thread_impl.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.
 
 #ifndef CONTENT_RENDERER_RENDER_THREAD_IMPL_H_
 #define CONTENT_RENDERER_RENDER_THREAD_IMPL_H_
 
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/observer_list.h"
 #include "base/time.h"
 #include "base/timer.h"
 #include "build/build_config.h"
 #include "content/common/child_process.h"
 #include "content/common/child_thread.h"
 #include "content/common/content_export.h"
 #include "content/common/css_colors.h"
 #include "content/common/gpu/client/gpu_channel_host.h"
 #include "content/common/gpu/gpu_process_launch_causes.h"
 #include "content/public/renderer/render_thread.h"
 #include "ipc/ipc_channel_proxy.h"
 #include "ui/gfx/native_widget_types.h"
 
 class AppCacheDispatcher;
 class AudioInputMessageFilter;
 class AudioMessageFilter;
+class AudioRendererMixerManager;
 class CompositorThread;
 class DBMessageFilter;
 class DevToolsAgentFilter;
 class DomStorageDispatcher;
 class GpuChannelHost;
 class IndexedDBDispatcher;
 class RendererWebKitPlatformSupportImpl;
 class SkBitmap;
 class VideoCaptureImplManager;
 struct ViewMsg_New_Params;
@@ skipping 177 matching lines @@
   // not sent for at least one notification delay.
   void PostponeIdleNotification();
 
   // Returns a graphics context shared among all
   // RendererGpuVideoDecoderFactories, or NULL on error.  Context remains owned
   // by this class and must be null-tested before each use to detect context
   // loss.  The returned WeakPtr<> is only valid on the compositor thread when
   // threaded compositing is enabled.
   base::WeakPtr<WebGraphicsContext3DCommandBufferImpl> GetGpuVDAContext3D();
 
+  // Return an AudioRendererMixerManager instance which manages renderer side

[jam, 2012/07/13 15:19:42]

nit: for simple getters like this, the documentation of what the variable does
goes by the member variable (i.e. line 313) and the getter isn't documented

[DaleCurtis, 2012/07/13 21:28:33]

Done.

+  // mixer instances shared based on configured audio parameters.
+  AudioRendererMixerManager* audio_renderer_mixer_manager() {
+    return audio_renderer_mixer_manager_.get();
+  }
+
  private:
   virtual bool OnControlMessageReceived(const IPC::Message& msg) OVERRIDE;
 
   void Init();
 
   void OnSetZoomLevelForCurrentURL(const std::string& host, double zoom_level);
   void OnSetCSSColors(const std::vector<CSSColors::CSSColorMapping>& colors);
   void OnCreateNewView(const ViewMsg_New_Params& params);
   void OnTransferBitmap(const SkBitmap& bitmap, int resource_id);
   void OnPurgePluginListCache(bool reload_pages);
@@ skipping 60 matching lines @@
   std::set<std::string> v8_extensions_;
 
   bool compositor_initialized_;
   scoped_ptr<CompositorThread> compositor_thread_;
   scoped_ptr<content::BrowserPluginRegistry> browser_plugin_registry_;
 
   ObserverList<content::RenderProcessObserver> observers_;
 
   scoped_ptr<WebGraphicsContext3DCommandBufferImpl> gpu_vda_context3d_;
 
+  scoped_ptr<AudioRendererMixerManager> audio_renderer_mixer_manager_;
+
   DISALLOW_COPY_AND_ASSIGN(RenderThreadImpl);
 };
 
 #endif  // CONTENT_RENDERER_RENDER_THREAD_IMPL_H_