Add a parameter to CreateAudioStream to choose between standard and low-latency mode.

chrome/common/render_messages_internal.h

 // Copyright (c) 2010 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.
 
 // This header is meant to be included in multiple passes, hence no traditional
 // header guard.
 // See ipc_message_macros.h for explanation of the macros and passes.
 
 #include <map>
 #include <string>
@@ skipping 1810 matching lines @@
 
   // Get the list of proxies to use for |url|, as a semicolon delimited list
   // of "<TYPE> <HOST>:<PORT>" | "DIRECT". See also
   // PluginProcessHostMsg_ResolveProxy which does the same thing.
   IPC_SYNC_MESSAGE_CONTROL1_2(ViewHostMsg_ResolveProxy,
                               GURL /* url */,
                               int /* network error */,
                               std::string /* proxy list */)
 
   // Request that got sent to browser for creating an audio output stream
-  IPC_MESSAGE_ROUTED2(ViewHostMsg_CreateAudioStream,
+  IPC_MESSAGE_ROUTED3(ViewHostMsg_CreateAudioStream,
                       int /* stream_id */,
-                      ViewHostMsg_Audio_CreateStream_Params)
+                      ViewHostMsg_Audio_CreateStream_Params,
+                      bool /* low-latency */)
 
   // Tell the browser the audio buffer prepared for stream
   // (render_view_id, stream_id) is filled and is ready to be consumed.
   IPC_MESSAGE_ROUTED2(ViewHostMsg_NotifyAudioPacketReady,
                       int /* stream_id */,
                       uint32 /* packet size */)
 
   // Start buffering the audio stream specified by (render_view_id, stream_id).
   IPC_MESSAGE_ROUTED1(ViewHostMsg_PlayAudioStream,
                       int /* stream_id */)
@@ skipping 429 matching lines @@
                        int /* render_view_id */,
                        int /* bridge_id */)
 
   // The |render_view_id| and |bridge_id| requests Geolocation service to
   // resume.
   IPC_MESSAGE_CONTROL2(ViewHostMsg_Geolocation_Resume,
                        int /* render_view_id */,
                        int /* bridge_id */)
 
 IPC_END_MESSAGES(ViewHost)