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

content/common/view_messages.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.
 
 // IPC messages for page rendering.
 // Multiply-included message file, hence no include guard.
 
 #include "base/process.h"
 #include "base/shared_memory.h"
 #include "content/common/content_export.h"
@@ skipping 664 matching lines @@
 // The message can also be sent during a renderer's lifetime if system colors
 // are updated.
 // TODO(jeremy): Possibly change IPC format once we have this all hooked up.
 IPC_MESSAGE_ROUTED1(ViewMsg_SetCSSColors,
                     std::vector<CSSColors::CSSColorMapping>)
 
 // Asks the browser for a unique routing ID.
 IPC_SYNC_MESSAGE_CONTROL0_1(ViewHostMsg_GenerateRoutingID,
                             int /* routing_id */)
 
+// Asks the browser for the default audio hardware buffer-size.
+IPC_SYNC_MESSAGE_CONTROL0_1(ViewHostMsg_GetHardwareBufferSize,
+                            uint32 /* buffer_size */)
+
 // Asks the browser for the default audio input hardware sample-rate.
 IPC_SYNC_MESSAGE_CONTROL0_1(ViewHostMsg_GetHardwareInputSampleRate,
                             double /* sample_rate */)
 
 // Asks the browser for the default audio hardware sample-rate.
 IPC_SYNC_MESSAGE_CONTROL0_1(ViewHostMsg_GetHardwareSampleRate,
                             double /* sample_rate */)
 
 // Tells the renderer to create a new view.
 // This message is slightly different, the view it takes (via
@@ skipping 1244 matching lines @@
                      media::MediaLogEvent /* event */)
 
 // Requests to lock the mouse. Will result in a ViewMsg_LockMouse_ACK message
 // being sent back.
 IPC_MESSAGE_ROUTED0(ViewHostMsg_LockMouse)
 
 // Requests to unlock the mouse. A ViewMsg_MouseLockLost message will be sent
 // whenever the mouse is unlocked (which may or may not be caused by
 // ViewHostMsg_UnlockMouse).
 IPC_MESSAGE_ROUTED0(ViewHostMsg_UnlockMouse)