Created multi-process-friendly PowerMonitor interface.

content/browser/gpu/gpu_process_host.h

Index: content/browser/gpu/gpu_process_host.h
diff --git a/content/browser/gpu/gpu_process_host.h b/content/browser/gpu/gpu_process_host.h
index 7acf083433f0dffa6d8c5ed374643f340254e7c3..4e1c86bb1e6cf356ff3981690eb9d76f5fb2142c 100644
--- a/content/browser/gpu/gpu_process_host.h
+++ b/content/browser/gpu/gpu_process_host.h
@@ -19,6 +19,7 @@
 #include "content/common/content_export.h"
 #include "content/common/gpu/gpu_memory_uma_stats.h"
 #include "content/common/gpu/gpu_process_launch_causes.h"
+#include "content/common/power_monitor_message_broadcaster.h"
 #include "content/public/browser/browser_child_process_host_delegate.h"
 #include "content/public/browser/gpu_data_manager.h"
 #include "googleurl/src/gurl.h"
@@ -265,6 +266,8 @@ class GpuProcessHost : public BrowserChildProcessHostDelegate,
       SurfaceRefMap;
   SurfaceRefMap surface_refs_;
 
+  PowerMonitorMessageBroadcaster power_monitor_broadcaster_;
+
   DISALLOW_COPY_AND_ASSIGN(GpuProcessHost);
 };