Created multi-process-friendly PowerMonitor interface.

content/gpu/gpu_main.cc

Index: content/gpu/gpu_main.cc
diff --git a/content/gpu/gpu_main.cc b/content/gpu/gpu_main.cc
index 794617dde93681fba6c84b4bba9635e1cf178bbc..1497c4ab83beca7b4a8ac143448d283e4ffb760e 100644
--- a/content/gpu/gpu_main.cc
+++ b/content/gpu/gpu_main.cc
@@ -11,6 +11,7 @@
 #include "base/debug/trace_event.h"
 #include "base/lazy_instance.h"
 #include "base/message_loop.h"
+#include "base/power_monitor/power_monitor.h"
 #include "base/rand_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/stringprintf.h"
@@ -19,6 +20,7 @@
 #include "content/child/child_process.h"
 #include "content/common/gpu/gpu_config.h"
 #include "content/common/gpu/gpu_messages.h"
+#include "content/common/power_monitor_broadcast_source.h"
 #include "content/common/sandbox_linux.h"
 #include "content/gpu/gpu_child_thread.h"
 #include "content/gpu/gpu_process.h"
@@ -169,6 +171,9 @@ int GpuMain(const MainFunctionParams& parameters) {
   delayed_watchdog_enable = true;
 #endif
 
+  PowerMonitorBroadcastSource* power_monitor_source =
+      new PowerMonitorBroadcastSource();
+  base::PowerMonitor power_monitor(power_monitor_source);
   scoped_refptr<GpuWatchdogThread> watchdog_thread;
 
   // Start the GPU watchdog only after anything that is expected to be time
@@ -286,6 +291,9 @@ int GpuMain(const MainFunctionParams& parameters) {
                                                     dead_on_arrival,
                                                     gpu_info,
                                                     deferred_messages.Get());
+
+  child_thread->channel()->AddFilter(power_monitor_source->MessageFilter());
+
   while (!deferred_messages.Get().empty())
     deferred_messages.Get().pop();