Add support for base::Closure in the MessageLoop.

content/gpu/gpu_watchdog_thread.h

 // 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.
 
 #ifndef CONTENT_GPU_GPU_WATCHDOG_THREAD_H_
 #define CONTENT_GPU_GPU_WATCHDOG_THREAD_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
@@ skipping 15 matching lines @@
   void CheckArmed();
 
  protected:
   virtual void Init();
   virtual void CleanUp();
 
  private:
 
   // An object of this type intercepts the reception and completion of all tasks
   // on the watched thread and checks whether the watchdog is armed.
-  class GpuWatchdogTaskObserver : public MessageLoop::TaskObserver {
+  class GpuWatchdogClosureObserver : public MessageLoop::ClosureObserver {
    public:
-    explicit GpuWatchdogTaskObserver(GpuWatchdogThread* watchdog);
-    virtual ~GpuWatchdogTaskObserver();
+    explicit GpuWatchdogClosureObserver(GpuWatchdogThread* watchdog);
+    virtual ~GpuWatchdogClosureObserver();
 
-    // Implements MessageLoop::TaskObserver.
-    virtual void WillProcessTask(const Task* task);
-    virtual void DidProcessTask(const Task* task);
+    // Implements MessageLoop::ClosureObserver.
+    virtual void WillProcessClosure(base::TimeTicks time_posted) OVERRIDE;
+    virtual void DidProcessClosure(base::TimeTicks time_posted) OVERRIDE;
 
    private:
     GpuWatchdogThread* watchdog_;
   };
 
   void OnAcknowledge();
   void OnCheck();
   void DeliberatelyCrashingToRecoverFromHang();
   void Disable();
 
   int64 GetWatchedThreadTime();
 
   MessageLoop* watched_message_loop_;
   int timeout_;
   volatile bool armed_;
-  GpuWatchdogTaskObserver task_observer_;
+  GpuWatchdogClosureObserver closure_observer_;
 
 #if defined(OS_WIN)
   void* watched_thread_handle_;
   int64 arm_cpu_time_;
 #endif
 
   base::Time arm_absolute_time_;
 
   typedef ScopedRunnableMethodFactory<GpuWatchdogThread> MethodFactory;
   scoped_ptr<MethodFactory> method_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuWatchdogThread);
 };
 
 #endif  // CONTENT_GPU_GPU_WATCHDOG_THREAD_H_