Battery Status API: add plumbing for multi-platform support.

content/browser/battery_status/battery_status_update_callback.h

Index: content/browser/battery_status/battery_status_update_callback.h
diff --git a/content/browser/battery_status/battery_status_update_callback.h b/content/browser/battery_status/battery_status_update_callback.h
new file mode 100644
index 0000000000000000000000000000000000000000..b34a353c0f0dc59195e6210f5cb8842faf93bdd5
--- /dev/null
+++ b/content/browser/battery_status/battery_status_update_callback.h
@@ -0,0 +1,18 @@
+// Copyright 2014 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.
+
+#ifndef CONTENT_BROWSER_BATTERY_STATUS_BATTERY_STATUS_UPDATE_CALLBACK_H_
+#define CONTENT_BROWSER_BATTERY_STATUS_BATTERY_STATUS_UPDATE_CALLBACK_H_
+
+#include "base/callback.h"
+#include "third_party/WebKit/public/platform/WebBatteryStatus.h"
+
+namespace content {
+
+typedef base::Callback<void(const blink::WebBatteryStatus&)>
+    BatteryStatusUpdateCallback;
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_BATTERY_STATUS_BATTERY_STATUS_UPDATE_CALLBACK_H_