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

chrome/renderer/pepper/pepper_flash_fullscreen_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/renderer/pepper/pepper_flash_fullscreen_host.h"
 
 #include "content/public/renderer/pepper_plugin_instance.h"
 #include "content/public/renderer/renderer_ppapi_host.h"
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/host/dispatch_host_message.h"
 #include "ppapi/host/host_message_context.h"
 #include "ppapi/host/ppapi_host.h"
 #include "ppapi/proxy/ppapi_messages.h"
 
 PepperFlashFullscreenHost::PepperFlashFullscreenHost(
     content::RendererPpapiHost* host,
     PP_Instance instance,
     PP_Resource resource)
     : ResourceHost(host->GetPpapiHost(), instance, resource),
       renderer_ppapi_host_(host) {}
 
 PepperFlashFullscreenHost::~PepperFlashFullscreenHost() {}
 
 int32_t PepperFlashFullscreenHost::OnResourceMessageReceived(
     const IPC::Message& msg,
     ppapi::host::HostMessageContext* context) {
-  IPC_BEGIN_MESSAGE_MAP(PepperFlashFullscreenHost, msg)
-  PPAPI_DISPATCH_HOST_RESOURCE_CALL(PpapiHostMsg_FlashFullscreen_SetFullscreen,
-                                    OnSetFullscreen)
-  IPC_END_MESSAGE_MAP()
+  PPAPI_BEGIN_MESSAGE_MAP(PepperFlashFullscreenHost, msg)
+    PPAPI_DISPATCH_HOST_RESOURCE_CALL(
+      PpapiHostMsg_FlashFullscreen_SetFullscreen,
+      OnSetFullscreen)
+  PPAPI_END_MESSAGE_MAP()
   return PP_ERROR_FAILED;
 }
 
 int32_t PepperFlashFullscreenHost::OnSetFullscreen(
     ppapi::host::HostMessageContext* context,
     bool fullscreen) {
   content::PepperPluginInstance* plugin_instance =
       renderer_ppapi_host_->GetPluginInstance(pp_instance());
   if (plugin_instance && plugin_instance->FlashSetFullscreen(fullscreen, true))
     return PP_OK;
   return PP_ERROR_FAILED;
 }