Add support for base::Closure in the MessageLoop.

content/renderer/renderer_main.cc

 // Copyright (c) 2011 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.
 
 #if defined(OS_MACOSX)
 #include <signal.h>
 #include <unistd.h>
 #endif  // OS_MACOSX
 
 #include "base/command_line.h"
@@ skipping 94 matching lines @@
 // This is a simplified version of the browser Jankometer, which measures
 // the processing time of tasks on the render thread.
 class RendererMessageLoopObserver : public MessageLoop::TaskObserver {
  public:
   RendererMessageLoopObserver()
       : process_times_(base::Histogram::FactoryGet(
             "Chrome.ProcMsgL RenderThread",
             1, 3600000, 50, base::Histogram::kUmaTargetedHistogramFlag)) {}
   virtual ~RendererMessageLoopObserver() {}
 
-  virtual void WillProcessTask(const Task* task) {
+  virtual void WillProcessTask(base::TimeTicks time_posted) {
     begin_process_message_ = base::TimeTicks::Now();
   }
 
-  virtual void DidProcessTask(const Task* task) {
-    if (begin_process_message_ != base::TimeTicks())
+  virtual void DidProcessTask(base::TimeTicks time_posted) {
+    if (!begin_process_message_.is_null())
       process_times_->AddTime(base::TimeTicks::Now() - begin_process_message_);
   }
 
  private:
   base::TimeTicks begin_process_message_;
   base::Histogram* const process_times_;
   DISALLOW_COPY_AND_ASSIGN(RendererMessageLoopObserver);
 };
 
 // mainline routine for running as the Renderer process
@@ skipping 100 matching lines @@
         pool->Recycle();
       TRACE_EVENT_BEGIN("RendererMain.START_MSG_LOOP", 0, 0);
       MessageLoop::current()->Run();
       TRACE_EVENT_END("RendererMain.START_MSG_LOOP", 0, 0);
     }
   }
   platform.PlatformUninitialize();
   TRACE_EVENT_END("RendererMain", 0, "");
   return 0;
 }