chromeos: Add support for the battery status API on chromeos.

content/common/battery_status_messages.h

+// 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.
+
+// IPC messages for battery status api.
+// Multiply-included message file, hence no include guard.
+
+#include "ipc/ipc_message_macros.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebBatteryStatus.h"
+
+#define IPC_MESSAGE_START BatteryStatusMsgStart
+
+IPC_STRUCT_TRAITS_BEGIN(WebKit::WebBatteryStatus)
+  IPC_STRUCT_TRAITS_MEMBER(charging)
+  IPC_STRUCT_TRAITS_MEMBER(chargingTime)
+  IPC_STRUCT_TRAITS_MEMBER(dischargingTime)
+  IPC_STRUCT_TRAITS_MEMBER(level)
+IPC_STRUCT_TRAITS_END()
+
+// Messages sent from the renderer to the browser.
+
+// Asks the browser process to start or stop sending battery status updates.
+IPC_MESSAGE_CONTROL1(BatteryStatusHostMsg_StartUpdating,
+                     int /* render_view_id */)
+
+IPC_MESSAGE_CONTROL1(BatteryStatusHostMsg_StopUpdating,
+                     int /* render_view_id */)
+
+// Messages sent from the browser to the renderer.
+
+// Sends the battery-status update to the renderer.
+IPC_MESSAGE_ROUTED1(BatteryStatusMsg_Updated,
+                    WebKit::WebBatteryStatus)