Created multi-process-friendly PowerMonitor interface.

content/common/power_monitor_messages.h

Index: content/common/power_monitor_messages.h
diff --git a/content/common/power_monitor_messages.h b/content/common/power_monitor_messages.h
new file mode 100644
index 0000000000000000000000000000000000000000..6a7c59f54afab029d812e25cc2a15e741dbe361e
--- /dev/null
+++ b/content/common/power_monitor_messages.h
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+// Copyright (c) 2013 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.
+
+// Multiply-included message file, no include guard.
+
+#include "ipc/ipc_message_macros.h"
+#include "ipc/ipc_param_traits.h"
+#include "ipc/ipc_platform_file.h"
+
+#define IPC_MESSAGE_START PowerMonitorMsgStart
+
+// Messages sent from the browser to the renderer/gpu.
+
+// Notification of a change in power status of the computer, such
+// as from switching between battery and A/C power.
+IPC_MESSAGE_CONTROL1(PowerMonitorMsg_PowerStateChange,
+    bool /* on_battery_power */)
+
+// Notification that the system is suspending.
+IPC_MESSAGE_CONTROL0(PowerMonitorMsg_Suspend)
+
+// Notification that the system is resuming.
+IPC_MESSAGE_CONTROL0(PowerMonitorMsg_Resume)