Use TimeTicks instead of gettimeofday in ProcessMetrics.

base/process/process_metrics_freebsd.cc

 // 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.
 
 #include "base/process/process_metrics.h"
 
 namespace base {
 
 ProcessMetrics::ProcessMetrics(ProcessHandle process)
     : process_(process),
-      last_cpu_time_(0),
       last_system_time_(0),
       last_cpu_(0) {
   processor_count_ = base::SysInfo::NumberOfProcessors();
 }
 
 // static
 ProcessMetrics* ProcessMetrics::CreateProcessMetrics(ProcessHandle process) {
   return new ProcessMetrics(process);
 }
 
@@ skipping 52 matching lines @@
   ws_usage->shared = 0;
 
   return true;
 }
 
 double ProcessMetrics::GetCPUUsage() {
   struct kinfo_proc info;
   int mib[] = { CTL_KERN, KERN_PROC, KERN_PROC_PID, process_ };
   size_t length = sizeof(info);
 
-  struct timeval now;
-  int retval = gettimeofday(&now, NULL);
-  if (retval)
-    return 0;
-
   if (sysctl(mib, arraysize(mib), &info, &length, NULL, 0) < 0)
     return 0;
 
   return (info.ki_pctcpu / FSCALE) * 100.0;
 }
 
 bool ProcessMetrics::GetIOCounters(IoCounters* io_counters) const {
   return false;
 }
 
@@ skipping 14 matching lines @@
       NULL, 0) < 0) {
     return 0;
   }
 
   pagesize = getpagesize();
 
   return mem_total - (mem_free*pagesize) - (mem_inactive*pagesize);
 }
 
 }  // namespace base