Battery Status API: add testing support for LayoutTests.

content/renderer/battery_status/fake_battery_status_dispatcher.cc

+// 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 "fake_battery_status_dispatcher.h"
+
+#include "base/bind.h"
+#include "base/location.h"
+#include "base/message_loop/message_loop_proxy.h"
+#include "third_party/WebKit/public/platform/WebBatteryStatusListener.h"
+
+namespace content {
+
+FakeBatteryStatusDispatcher::FakeBatteryStatusDispatcher() : listener_(0) {
+}
+
+void FakeBatteryStatusDispatcher::SetListener(
+    blink::WebBatteryStatusListener* listener) {
+  listener_ = listener;
+}
+
+void FakeBatteryStatusDispatcher::PostBatteryStatusChange(
+    const blink::WebBatteryStatus& status) {
+  if (!listener_)
+    return;
+
+  base::MessageLoopProxy::current()->PostTask(
+      FROM_HERE,
+      base::Bind(&blink::WebBatteryStatusListener::updateBatteryStatus,
+                 base::Unretained(listener_),
+                 status));
+}
+
+}  // namespace content