Use TimeTicks instead of gettimeofday in ProcessMetrics.

base/process/process_metrics.h

 // Copyright (c) 2013 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.
 
 // This file contains routines for gathering resource statistics for processes
 // running on the system.
 
 #ifndef BASE_PROCESS_PROCESS_METRICS_H_
 #define BASE_PROCESS_PROCESS_METRICS_H_
 
@@ skipping 187 matching lines @@
 #if defined(OS_CHROMEOS)
   bool GetWorkingSetKBytesTotmaps(WorkingSetKBytes *ws_usage) const;
 #endif
 
   ProcessHandle process_;
 
   int processor_count_;
 
   // Used to store the previous times and CPU usage counts so we can
   // compute the CPU usage between calls.
-  int64 last_cpu_time_;
+  TimeTicks last_cpu_time_;
   int64 last_system_time_;
 
   // Same thing for idle wakeups.
-  int64 last_idle_wakeups_time_;
+  TimeTicks last_idle_wakeups_time_;
   int64 last_absolute_idle_wakeups_;
 
 #if !defined(OS_IOS)
 #if defined(OS_MACOSX)
   // Queries the port provider if it's set.
   mach_port_t TaskForPid(ProcessHandle process) const;
 
   PortProvider* port_provider_;
 #elif defined(OS_POSIX)
   // Jiffie count at the last_cpu_time_ we updated.
@@ skipping 156 matching lines @@
   SystemDiskInfo disk_info_;
 #endif
 #if defined(OS_CHROMEOS)
   SwapInfo swap_info_;
 #endif
 };
 
 }  // namespace base
 
 #endif  // BASE_PROCESS_PROCESS_METRICS_H_