Use TimeTicks instead of gettimeofday in ProcessMetrics.

base/process/process_metrics_openbsd.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"
 
 #include <sys/param.h>
 #include <sys/sysctl.h>
 
 namespace base {
@@ skipping 88 matching lines @@
 
   mib[5] = (length / sizeof(struct kinfo_proc));
 
   if (sysctl(mib, arraysize(mib), &info, &length, NULL, 0) < 0)
     return 0;
 
   return info.p_pctcpu;
 }
 
 double ProcessMetrics::GetCPUUsage() {
-  struct timeval now;
+  TimeTicks time = TimeTicks::Now();
 
-  int retval = gettimeofday(&now, NULL);
-  if (retval)
-    return 0;
-
-  int64 time = TimeValToMicroseconds(now);
-
-  if (last_cpu_time_ == 0) {
+  if (last_cpu_ == 0) {
     // First call, just set the last values.
-    last_cpu_time_ = time;
+    last_cpu_walltime_ = time;
     last_cpu_ = GetProcessCPU(process_);
     return 0;
   }
 
-  int64 time_delta = time - last_cpu_time_;
+  int64 time_delta = (time - last_cpu_walltime_).InMicroseconds();
   DCHECK_NE(time_delta, 0);
 
   if (time_delta == 0)
     return 0;
 
   int cpu = GetProcessCPU(process_);
 
-  last_cpu_time_ = time;
+  last_cpu_walltime_ = time;
   last_cpu_ = cpu;
 
   double percentage = static_cast<double>((cpu * 100.0) / FSCALE);
 
   return percentage;
 }
 
 ProcessMetrics::ProcessMetrics(ProcessHandle process)
     : process_(process),
-      last_cpu_time_(0),
       last_system_time_(0),
       last_cpu_(0) {
 
   processor_count_ = base::SysInfo::NumberOfProcessors();
 }
 
 size_t GetSystemCommitCharge() {
   int mib[] = { CTL_VM, VM_METER };
   int pagesize;
   struct vmtotal vmtotal;
   unsigned long mem_total, mem_free, mem_inactive;
   size_t len = sizeof(vmtotal);
 
   if (sysctl(mib, arraysize(mib), &vmtotal, &len, NULL, 0) < 0)
     return 0;
 
   mem_total = vmtotal.t_vm;
   mem_free = vmtotal.t_free;
   mem_inactive = vmtotal.t_vm - vmtotal.t_avm;
 
   pagesize = getpagesize();
 
   return mem_total - (mem_free*pagesize) - (mem_inactive*pagesize);
 }
 
 }  // namespace base