MessageLoop's RUN method will pass a const ref to PendingTask when

content/gpu/gpu_watchdog_thread.h

 // 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.
 
 #ifndef CONTENT_GPU_GPU_WATCHDOG_THREAD_H_
 #define CONTENT_GPU_GPU_WATCHDOG_THREAD_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/message_loop.h"
@@ skipping 26 matching lines @@
   friend class base::RefCountedThreadSafe<GpuWatchdogThread>;
 
   // 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 {
    public:
     explicit GpuWatchdogTaskObserver(GpuWatchdogThread* watchdog);
     virtual ~GpuWatchdogTaskObserver();
 
     // Implements MessageLoop::TaskObserver.
-    virtual void WillProcessTask(base::TimeTicks time_posted) OVERRIDE;
-    virtual void DidProcessTask(base::TimeTicks time_posted) OVERRIDE;
+    virtual void WillProcessTask(
+        const base::PendingTask& pending_task) OVERRIDE;
+    virtual void DidProcessTask(const base::PendingTask& pending_task) OVERRIDE;
 
    private:
     GpuWatchdogThread* watchdog_;
   };
 
   virtual ~GpuWatchdogThread();
 
   void OnAcknowledge();
   void OnCheck(bool after_suspend);
   void DeliberatelyTerminateToRecoverFromHang();
@@ skipping 17 matching lines @@
   base::Time suspension_timeout_;
 
   base::WeakPtrFactory<GpuWatchdogThread> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuWatchdogThread);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_GPU_GPU_WATCHDOG_THREAD_H_