Move Mus into chrome's process when running with --mus.

services/ui/gpu/gpu_main.cc

Index: services/ui/gpu/gpu_main.cc
diff --git a/services/ui/gpu/gpu_main.cc b/services/ui/gpu/gpu_main.cc
index cb42d4df66818aea86a32f6e182583d6f697552e..76eb09432a68698bdc246241ee90222f866e11ca 100644
--- a/services/ui/gpu/gpu_main.cc
+++ b/services/ui/gpu/gpu_main.cc
@@ -52,8 +52,12 @@ GpuMain::GpuMain(mojom::GpuMainRequest request)
     : gpu_thread_("GpuThread"),
       io_thread_("GpuIOThread"),
       compositor_thread_("DisplayCompositorThread"),
-      power_monitor_(base::MakeUnique<base::PowerMonitorDeviceSource>()),
       binding_(this) {
+  // TODO: OK?
+  if (!base::PowerMonitor::Get())
+    power_monitor_.reset(new base::PowerMonitor(
+        base::MakeUnique<base::PowerMonitorDeviceSource>()));
+
   base::Thread::Options thread_options;
 
 #if defined(OS_WIN)