Adds proper IPC usage for AudioDevice::GetAudioHardwareBufferSize().

content/browser/renderer_host/render_message_filter.h

 // Copyright (c) 2011 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_BROWSER_RENDERER_HOST_RENDER_MESSAGE_FILTER_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_MESSAGE_FILTER_H_
 #pragma once
 
 #if defined(OS_WIN)
 #include <windows.h>
@@ skipping 164 matching lines @@
                                   int request_id,
                                   const FilePath& path);
   void OnGenerateRoutingID(int* route_id);
   void OnDownloadUrl(const IPC::Message& message,
                      const GURL& url,
                      const GURL& referrer,
                      const string16& suggested_name);
   void OnCheckNotificationPermission(const GURL& source_origin,
                                      int* permission_level);
 
+  void OnGetHardwareBufferSize(uint32* buffer_size);
   void OnGetHardwareInputSampleRate(double* sample_rate);
   void OnGetHardwareSampleRate(double* sample_rate);
 
   // Used to ask the browser to allocate a block of shared memory for the
   // renderer to send back data in, since shared memory can't be created
   // in the renderer on POSIX due to the sandbox.
   void OnAllocateSharedMemory(uint32 buffer_size,
                               base::SharedMemoryHandle* handle);
   void OnResolveProxy(const GURL& url, IPC::Message* reply_msg);
 
@@ skipping 67 matching lines @@
   scoped_refptr<WebKitContext> webkit_context_;
 
   int render_process_id_;
 
   std::set<OpenChannelToNpapiPluginCallback*> plugin_host_clients_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderMessageFilter);
 };
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_MESSAGE_FILTER_H_