Change outputting ints in win/linux GetCpuUsage to doubles.

base/process/process_metrics_linux.cc

Index: base/process/process_metrics_linux.cc
diff --git a/base/process/process_metrics_linux.cc b/base/process/process_metrics_linux.cc
index 2d54c4c72657da6b2c54674c7fec9cb3a5577725..c564a6798baa6623a3646c35822b5041e1e5ad47 100644
--- a/base/process/process_metrics_linux.cc
+++ b/base/process/process_metrics_linux.cc
@@ -228,7 +228,7 @@ double ProcessMetrics::GetCPUUsage() {
   // are together adding to more than one CPU's worth.
   TimeDelta cpu_time = internal::ClockTicksToTimeDelta(cpu);
   TimeDelta last_cpu_time = internal::ClockTicksToTimeDelta(last_cpu_);
-  int percentage = 100 * (cpu_time - last_cpu_time).InSecondsF() /
+  double percentage = 100.0 * (cpu_time - last_cpu_time).InSecondsF() /
       TimeDelta::FromMicroseconds(time_delta).InSecondsF();
 
   last_cpu_time_ = time;