Created multi-process-friendly PowerMonitor interface.

content/common/gpu/gpu_channel.cc

Index: content/common/gpu/gpu_channel.cc
diff --git a/content/common/gpu/gpu_channel.cc b/content/common/gpu/gpu_channel.cc
index 0c5172cf45cf0a9c5586381dc8f7687b3ee10c03..951dbe4ff115ce3028551bd26e4cbbc94c962be0 100644
--- a/content/common/gpu/gpu_channel.cc
+++ b/content/common/gpu/gpu_channel.cc
@@ -22,6 +22,7 @@
 #include "content/common/gpu/gpu_channel_manager.h"
 #include "content/common/gpu/gpu_messages.h"
 #include "content/common/gpu/sync_point_manager.h"
+#include "content/common/power_monitor_message_filter.h"
 #include "content/public/common/content_switches.h"
 #include "crypto/hmac.h"
 #include "gpu/command_buffer/common/mailbox.h"
@@ -487,6 +488,9 @@ bool GpuChannel::Init(base::MessageLoopProxy* io_message_loop,
   io_message_loop_ = io_message_loop;
   channel_->AddFilter(filter_.get());
 
+  power_monitor_filter_ = new PowerMonitorMessageFilter();
+  channel_->AddFilter(power_monitor_filter_.get());
+
   return true;
 }