Fix webrtcAudioPrivate API to handle requests from <webview>s.

content/public/browser/render_process_host.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_PUBLIC_BROWSER_RENDER_PROCESS_HOST_H_
 #define CONTENT_PUBLIC_BROWSER_RENDER_PROCESS_HOST_H_
 
+#include <list>
+
 #include "base/basictypes.h"
 #include "base/id_map.h"
 #include "base/process/kill.h"
 #include "base/process/process_handle.h"
 #include "base/supports_user_data.h"
 #include "content/common/content_export.h"
 #include "ipc/ipc_channel_proxy.h"
 #include "ipc/ipc_sender.h"
 #include "ui/gfx/native_widget_types.h"
 
 class GURL;
 struct ViewMsg_SwapOut_Params;
 
 namespace base {
 class TimeDelta;
 }
 
 namespace gpu {
 union ValueState;
 }
 
+namespace media {
+class AudioOutputController;
+}
+
 namespace content {
 class BrowserContext;
 class BrowserMessageFilter;
 class RenderProcessHostObserver;
 class RenderWidgetHost;
 class ServiceRegistry;
 class StoragePartition;
 struct GlobalRequestID;
 
 // Interface that represents the browser side of the browser <-> renderer
@@ skipping 262 matching lines @@
   // Overrides the default heuristic for limiting the max renderer process
   // count.  This is useful for unit testing process limit behaviors.  It is
   // also used to allow a command line parameter to configure the max number of
   // renderer processes and should only be called once during startup.
   // A value of zero means to use the default heuristic.
   static void SetMaxRendererProcessCount(size_t count);
 
   // Returns the current maximum number of renderer process hosts kept by the
   // content module.
   static size_t GetMaxRendererProcessCount();
+
+  // Retrieves the list of AudioOutputController objects associated
+  // with this object and passes it to the callback you specify, on
+  // the same thread on which you called the method.
+  typedef std::list<scoped_refptr<media::AudioOutputController>>
+      AudioOutputControllerList;
+  typedef base::Callback<void(const AudioOutputControllerList&)>
+      GetAudioOutputControllersCallback;
+  virtual void GetAudioOutputControllers(
+      const GetAudioOutputControllersCallback& callback) const = 0;

[jam, 2015/01/29 00:19:05]

move this above the "// Static management functions
-----------------------------------------------"

 };
 
 }  // namespace content.
 
 #endif  // CONTENT_PUBLIC_BROWSER_RENDER_PROCESS_HOST_H_