Add BatteryStatusEventPump in Chromium for sending Battery status events

content/renderer/battery_status/battery_status_event_pump.cc

+// Copyright (c) 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.
+
+#include "content/renderer/battery_status/battery_status_event_pump.h"
+
+namespace content {
+
+BatteryStatusEventPump::BatteryStatusEventPump() {
+}
+
+BatteryStatusEventPump::~BatteryStatusEventPump() {
+}
+
+void BatteryStatusEventPump::Attach(RenderThread* thread) {
+  if (!thread)
+    return;
+  thread->AddObserver(this);
+}
+
+bool BatteryStatusEventPump::OnControlMessageReceived(
+    const IPC::Message& msg) {
+  bool handled = true;
+
+  return handled;
+}
+
+void BatteryStatusEventPump::SetBatteryStatusListener(
+    blink::WebBatteryStatusListener* listener) {
+  listener_ = listener;
+}
+
+}  // namespace content