Created multi-process-friendly PowerMonitor interface.

content/gpu/gpu_main.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stdlib.h>
 
 #if defined(OS_WIN)
 #include <windows.h>
 #endif
 
 #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"
 #include "base/threading/platform_thread.h"
 #include "build/build_config.h"
 #include "content/child/child_process.h"
 #include "content/common/content_constants_internal.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"
 #include "content/gpu/gpu_watchdog_thread.h"
 #include "content/public/common/content_client.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/common/main_function_params.h"
 #include "crypto/hmac.h"
 #include "gpu/config/gpu_info_collector.h"
 #include "ui/gl/gl_implementation.h"
@@ skipping 133 matching lines @@
 #endif
 
   bool delayed_watchdog_enable = false;
 
 #if defined(OS_CHROMEOS)
   // Don't start watchdog immediately, to allow developers to switch to VT2 on
   // startup.
   delayed_watchdog_enable = true;
 #endif
 
+  scoped_ptr<PowerMonitorBroadcastSource> power_monitor_source(

[jam, 2013/07/17 00:29:42]

this should be connected in all processes (i.e. in ChildProcess or ChildThread)
since you put this class in content/common

+      new PowerMonitorBroadcastSource(main_message_loop.message_loop_proxy()));
+  IPC::ChannelProxy::MessageFilter* power_monitor_message_filter =
+      power_monitor_source->MessageFilter();
+  scoped_ptr<base::PowerMonitor> power_monitor(new base::PowerMonitor(
+      power_monitor_source.PassAs<base::PowerMonitorSource>()));
+
   scoped_refptr<GpuWatchdogThread> watchdog_thread;
 
   // Start the GPU watchdog only after anything that is expected to be time
   // consuming has completed, otherwise the process is liable to be aborted.
   if (enable_watchdog && !delayed_watchdog_enable) {
     watchdog_thread = new GpuWatchdogThread(kGpuTimeout);
     watchdog_thread->Start();
   }
 
   gpu::GPUInfo gpu_info;
@@ skipping 94 matching lines @@
   }
 
   logging::SetLogMessageHandler(NULL);
 
   GpuProcess gpu_process;
 
   GpuChildThread* child_thread = new GpuChildThread(watchdog_thread.get(),
                                                     dead_on_arrival,
                                                     gpu_info,
                                                     deferred_messages.Get());
+
+  child_thread->channel()->AddFilter(power_monitor_message_filter);
+
   while (!deferred_messages.Get().empty())
     deferred_messages.Get().pop();
 
   child_thread->Init(start_time);
 
   gpu_process.set_main_thread(child_thread);
 
   {
     TRACE_EVENT0("gpu", "Run Message Loop");
     main_message_loop.Run();
@@ skipping 127 matching lines @@
     return true;
   }
 
   return false;
 }
 #endif  // defined(OS_WIN)
 
 }  // namespace.
 
 }  // namespace content