Reland "Replace Chrome IPC with Mojo IPC for querying BatteryStatus service"

device/battery/battery_monitor_impl.cc

Index: device/battery/battery_monitor_impl.cc
diff --git a/device/battery/battery_monitor_impl.cc b/device/battery/battery_monitor_impl.cc
new file mode 100644
index 0000000000000000000000000000000000000000..3cbf57d39394caa1e227fb677c4679a32bb24912
--- /dev/null
+++ b/device/battery/battery_monitor_impl.cc
@@ -0,0 +1,34 @@
+// 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.
+
+#include "device/battery/battery_monitor_impl.h"
+
+#include "base/bind.h"
+
+namespace device {
+
+// static
+void BatteryMonitorImpl::Create(
+    mojo::InterfaceRequest<BatteryMonitor> request) {
+  BindToRequest(new BatteryMonitorImpl(), &request);
+}
+
+BatteryMonitorImpl::BatteryMonitorImpl() {
+}
+
+BatteryMonitorImpl::~BatteryMonitorImpl() {
+}
+
+void BatteryMonitorImpl::OnConnectionEstablished() {
+  subscription_ = BatteryStatusService::GetInstance()->AddCallback(
+        base::Bind(&BatteryMonitorImpl::DidChange, base::Unretained(this)));
+}
+
+void BatteryMonitorImpl::DidChange(const BatteryStatus& battery_status) {
+  BatteryStatusPtr status(BatteryStatus::New());
+  *status = battery_status;
+  client()->DidChange(status.Pass());
+}
+
+}  // namespace device