More accurate implementation of watched thread time for Gpu Watchdog.

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/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
@@ skipping 70 matching lines @@
   bool MatchXEventAtom(XEvent* event);
 #endif
 
   void OnAddPowerObserver();
 
   // Implement PowerObserver.
   void OnSuspend() override;
   void OnResume() override;
 
 #if defined(OS_WIN)
-  base::TimeDelta GetWatchedThreadTime();
+  base::ThreadTicks GetWatchedThreadTime();
 #endif
 
   base::MessageLoop* watched_message_loop_;
   base::TimeDelta timeout_;
   volatile bool armed_;
   GpuWatchdogTaskObserver task_observer_;
 
   // True if the watchdog should wait for a certain amount of CPU to be used
   // before killing the process.
   bool use_thread_cpu_time_;
 
   // The number of consecutive acknowledgements that had a latency less than
   // 50ms.
   int responsive_acknowledge_count_;
 
 #if defined(OS_WIN)
   void* watched_thread_handle_;
-  base::TimeDelta arm_cpu_time_;
+  base::ThreadTicks arm_cpu_time_;
 
   // This measures the time that the system has been running, in units of 100
   // ns.
   ULONGLONG arm_interrupt_time_;
 #endif
 
   // Time after which it's assumed that the computer has been suspended since
   // the task was posted.
   base::Time suspension_timeout_;
 
@@ skipping 18 matching lines @@
 #endif
 
   base::WeakPtrFactory<GpuWatchdogThread> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuWatchdogThread);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_GPU_GPU_WATCHDOG_THREAD_H_