Initialize PowerMonitor on_power_battery intitial value for newly created processes.

content/browser/renderer_host/render_process_host_impl.cc

Index: content/browser/renderer_host/render_process_host_impl.cc
diff --git a/content/browser/renderer_host/render_process_host_impl.cc b/content/browser/renderer_host/render_process_host_impl.cc
index c629485f9059f0cd40fdcc431afc5543dfdf0eae..0d2a11be6e6f189f97021a281ebf1005c04dae71 100644
--- a/content/browser/renderer_host/render_process_host_impl.cc
+++ b/content/browser/renderer_host/render_process_host_impl.cc
@@ -653,6 +653,8 @@ bool RenderProcessHostImpl::Init() {
     GpuDataManagerImpl::GetInstance()->AddObserver(this);
   }
 
+  power_monitor_broadcaster_.Init();
+
   is_initialized_ = true;
   return true;
 }