Simplify threading in browser thread by making only ChromeThread deal with di...

chrome/browser/chrome_plugin_host.cc

 // Copyright (c) 2009 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/chrome_plugin_host.h"
 
 #include <set>
 
 #include "base/basictypes.h"
 #include "base/command_line.h"
@@ skipping 717 matching lines @@
 CPError STDCALL CPB_SendSyncMessage(CPID id, const void *data, uint32 data_len,
                                     void **retval, uint32 *retval_len) {
   NOTREACHED() << "Sync messages should not be sent from the browser process.";
 
   return CPERR_FAILURE;
 }
 
 CPError STDCALL CPB_PluginThreadAsyncCall(CPID id,
                                           void (*func)(void *),
                                           void *user_data) {
-  MessageLoop *message_loop = ChromeThread::GetMessageLoop(ChromeThread::IO);
-  if (!message_loop) {
-    return CPERR_FAILURE;
-  }
-  message_loop->PostTask(FROM_HERE, NewRunnableFunction(func, user_data));
-
-  return CPERR_SUCCESS;
+  bool posted = ChromeThread::PostTask(
+      ChromeThread::IO, FROM_HERE,
+      NewRunnableFunction(func, user_data));
+  return posted ? CPERR_SUCCESS : CPERR_FAILURE;
 }
 
 CPError STDCALL CPB_OpenFileDialog(CPID id,
                                    CPBrowsingContext context,
                                    bool multiple_files,
                                    const char *title,
                                    const char *filter,
                                    void *user_data) {
   NOTREACHED() <<
     "Open file dialog should only be called from the renderer process.";
@@ skipping 62 matching lines @@
 void CPHandleCommand(int command, CPCommandInterface* data,
                      CPBrowsingContext context) {
   // Sadly if we try and pass context through, we seem to break cl's little
   // brain trying to compile the Tuple3 ctor. This cast works.
   int32 context_as_int32 = static_cast<int32>(context);
   // Plugins can only be accessed on the IO thread.
   g_browser_process->io_thread()->message_loop()->PostTask(FROM_HERE,
       NewRunnableFunction(PluginCommandHandler::HandleCommand,
                           command, data, context_as_int32));
 }