Add support for passing an arbitrary parameter to an IPC message handler. The motivation is for Web…

chrome/browser/renderer_host/pepper/pepper_talk_host.cc

 // 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.
 
 #include "chrome/browser/renderer_host/pepper/pepper_talk_host.h"
 
 #include "base/bind.h"
 #include "content/public/browser/browser_ppapi_host.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/render_frame_host.h"
@@ skipping 135 matching lines @@
   if (remoting_started_) {
     content::BrowserThread::PostTask(content::BrowserThread::UI,
                                      FROM_HERE,
                                      base::Bind(&StopRemotingOnUIThread));
   }
 }
 
 int32_t PepperTalkHost::OnResourceMessageReceived(
     const IPC::Message& msg,
     ppapi::host::HostMessageContext* context) {
-  IPC_BEGIN_MESSAGE_MAP(PepperTalkHost, msg)
-  PPAPI_DISPATCH_HOST_RESOURCE_CALL(PpapiHostMsg_Talk_RequestPermission,
-                                    OnRequestPermission)
-  PPAPI_DISPATCH_HOST_RESOURCE_CALL_0(PpapiHostMsg_Talk_StartRemoting,
-                                      OnStartRemoting)
-  PPAPI_DISPATCH_HOST_RESOURCE_CALL_0(PpapiHostMsg_Talk_StopRemoting,
-                                      OnStopRemoting)
-  IPC_END_MESSAGE_MAP()
+  PPAPI_BEGIN_MESSAGE_MAP(PepperTalkHost, msg)
+    PPAPI_DISPATCH_HOST_RESOURCE_CALL(PpapiHostMsg_Talk_RequestPermission,
+                                      OnRequestPermission)
+    PPAPI_DISPATCH_HOST_RESOURCE_CALL_0(PpapiHostMsg_Talk_StartRemoting,
+                                        OnStartRemoting)
+    PPAPI_DISPATCH_HOST_RESOURCE_CALL_0(PpapiHostMsg_Talk_StopRemoting,
+                                        OnStopRemoting)
+  PPAPI_END_MESSAGE_MAP()
   return PP_ERROR_FAILED;
 }
 
 int32_t PepperTalkHost::OnRequestPermission(
     ppapi::host::HostMessageContext* context,
     PP_TalkPermission permission) {
   if (permission < PP_TALKPERMISSION_SCREENCAST ||
       permission >= PP_TALKPERMISSION_NUM_PERMISSIONS)
     return PP_ERROR_BADARGUMENT;
 
@@ skipping 74 matching lines @@
 }
 
 void PepperTalkHost::OnStopRemotingCompleted(
     ppapi::host::ReplyMessageContext reply) {
   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::IO));
   remoting_started_ = false;
   host()->SendReply(reply, PpapiPluginMsg_Talk_StopRemotingReply());
 }
 
 }  // namespace chrome