Introduce AudioHardwareConfig for renderer side audio device info.

content/common/view_messages.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.
 
 // IPC messages for page rendering.
 // Multiply-included message file, hence no include guard.
 
 #include "base/process.h"
 #include "base/shared_memory.h"
 #include "base/string16.h"
@@ skipping 702 matching lines @@
 // The resulting page history is [-1 -1 -1 7 8].
 IPC_MESSAGE_ROUTED2(ViewMsg_SetHistoryLengthAndPrune,
                     int, /* merge_history_length */
                     int32 /* minimum_page_id */)
 
 // 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,
-                            int /* sample_rate */)
-
-// Asks the browser for the default audio hardware sample-rate.
-IPC_SYNC_MESSAGE_CONTROL0_1(ViewHostMsg_GetHardwareSampleRate,
-                            int /* sample_rate */)
-
-// Asks the browser for the default channel layout.
-IPC_SYNC_MESSAGE_CONTROL0_1(ViewHostMsg_GetHardwareInputChannelLayout,
-                            media::ChannelLayout /* channel layout */)
+IPC_SYNC_MESSAGE_CONTROL0_4(ViewHostMsg_GetAudioHardwareConfig,
+                            int /* output_buffer_size */,
+                            int /* output_sample_rate */,
+                            int /* input_sample_rate */,
+                            media::ChannelLayout /* input channel layout */)

[jam, 2013/02/01 00:21:33]

nit: here and in other ipc files, the convention is to put the parameter name
from the dispatching method inside the comment. so no spaces.

[DaleCurtis, 2013/02/01 00:25:51]

Done.

 
 // Asks the browser for CPU usage of the renderer process in percents.
 IPC_SYNC_MESSAGE_CONTROL0_1(ViewHostMsg_GetCPUUsage,
                             int /* CPU usage in percents */)
 
 // Asks the browser for the user's monitor profile.
 IPC_SYNC_MESSAGE_CONTROL0_1(ViewHostMsg_GetMonitorColorProfile,
                             std::vector<char> /* profile */)
 
 // Tells the renderer to create a new view.
@@ skipping 1631 matching lines @@
 // cached by the OS. Please see RenderMessageFilter::OnPreCacheFontCharacters
 // for details.
 IPC_SYNC_MESSAGE_CONTROL2_0(ViewHostMsg_PreCacheFontCharacters,
                             LOGFONT /* font_data */,
                             string16 /* characters */)
 #endif
 
 // Notifies the browser that the frame with the given id was detached.
 IPC_MESSAGE_ROUTED1(ViewHostMsg_FrameDetached,
                     int64 /* frame_id */)