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

chrome/renderer/pepper/pepper_flash_font_file_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_font_file_host.h"
 
 #include "build/build_config.h"
 #include "content/public/renderer/renderer_ppapi_host.h"
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/host/dispatch_host_message.h"
@@ skipping 23 matching lines @@
       charset,
       PP_BROWSERFONT_TRUSTED_FAMILY_DEFAULT);
 #endif  // defined(OS_LINUX) || defined(OS_OPENBSD)
 }
 
 PepperFlashFontFileHost::~PepperFlashFontFileHost() {}
 
 int32_t PepperFlashFontFileHost::OnResourceMessageReceived(
     const IPC::Message& msg,
     ppapi::host::HostMessageContext* context) {
-  IPC_BEGIN_MESSAGE_MAP(PepperFlashFontFileHost, msg)
-  PPAPI_DISPATCH_HOST_RESOURCE_CALL(PpapiHostMsg_FlashFontFile_GetFontTable,
-                                    OnGetFontTable)
-  IPC_END_MESSAGE_MAP()
+  PPAPI_BEGIN_MESSAGE_MAP(PepperFlashFontFileHost, msg)
+    PPAPI_DISPATCH_HOST_RESOURCE_CALL(PpapiHostMsg_FlashFontFile_GetFontTable,
+                                      OnGetFontTable)
+  PPAPI_END_MESSAGE_MAP()
   return PP_ERROR_FAILED;
 }
 
 int32_t PepperFlashFontFileHost::OnGetFontTable(
     ppapi::host::HostMessageContext* context,
     uint32_t table) {
   std::string contents;
   int32_t result = PP_ERROR_FAILED;
 #if defined(OS_LINUX) || defined(OS_OPENBSD)
   if (fd_ != -1) {
     size_t length = 0;
     if (content::GetFontTable(fd_, table, 0 /* offset */, NULL, &length)) {
       contents.resize(length);
       uint8_t* contents_ptr =
           reinterpret_cast<uint8_t*>(const_cast<char*>(contents.c_str()));
       if (content::GetFontTable(
               fd_, table, 0 /* offset */, contents_ptr, &length)) {
         result = PP_OK;
       } else {
         contents.clear();
       }
     }
   }
 #endif  // defined(OS_LINUX) || defined(OS_OPENBSD)
 
   context->reply_msg = PpapiPluginMsg_FlashFontFile_GetFontTableReply(contents);
   return result;
 }