Change outputting ints in win/linux GetCpuUsage to doubles.

base/process/process_metrics_win.cc

Index: base/process/process_metrics_win.cc
diff --git a/base/process/process_metrics_win.cc b/base/process/process_metrics_win.cc
index 1dd97e629cf4e74e93fb50f51a288c10bcccbd6c..6c424e3cacf2446980d21c0c0693f83cba2fdebe 100644
--- a/base/process/process_metrics_win.cc
+++ b/base/process/process_metrics_win.cc
@@ -225,14 +225,11 @@ double ProcessMetrics::GetCPUUsage() {
   if (time_delta == 0)
     return 0;
 
-  // We add time_delta / 2 so the result is rounded.
-  int cpu = static_cast<int>((system_time_delta * 100 + time_delta / 2) /
-                             time_delta);
 
   last_system_time_ = system_time;
   last_cpu_time_ = time;
 
-  return cpu;
+  return static_cast<double>(system_time_delta * 100.0) / time_delta;
 }
 
 bool ProcessMetrics::GetIOCounters(IoCounters* io_counters) const {