Created multi-process-friendly PowerMonitor interface.

content/browser/renderer_host/render_process_host_impl.h

Index: content/browser/renderer_host/render_process_host_impl.h
diff --git a/content/browser/renderer_host/render_process_host_impl.h b/content/browser/renderer_host/render_process_host_impl.h
index 65d85a00b3f47a39134fcfb416ea0de18d7388b0..72ec846303d4dfdbf235269b91884270dfa014e6 100644
--- a/content/browser/renderer_host/render_process_host_impl.h
+++ b/content/browser/renderer_host/render_process_host_impl.h
@@ -13,6 +13,7 @@
 #include "base/process/process.h"
 #include "base/timer/timer.h"
 #include "content/browser/child_process_launcher.h"
+#include "content/browser/power_monitor_message_broadcaster.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/global_request_id.h"
 #include "content/public/browser/gpu_data_manager_observer.h"
@@ -320,6 +321,9 @@ class CONTENT_EXPORT RenderProcessHostImpl
   // than once.
   bool gpu_observer_registered_;
 
+  // Forwards power state messages to the renderer process.
+  PowerMonitorMessageBroadcaster power_monitor_broadcaster_;
+
   DISALLOW_COPY_AND_ASSIGN(RenderProcessHostImpl);
 };