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

content/renderer/battery_status_dispatcher.cc

+// 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.
+
+#include "content/renderer/battery_status_dispatcher.h"
+
+#include "base/pickle.h"
+#include "content/common/battery_status_messages.h"
+#include "content/renderer/render_view_impl.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebBatteryStatus.h"
+
+BatteryStatusDispatcher::BatteryStatusDispatcher(RenderViewImpl* render_view)
+    : content::RenderViewObserver(render_view),
+      started_(false) {
+}
+
+BatteryStatusDispatcher::~BatteryStatusDispatcher() {
+  if (started_)
+    stopUpdating();
+}
+
+bool BatteryStatusDispatcher::OnMessageReceived(const IPC::Message& msg) {
+  bool handled = true;
+  IPC_BEGIN_MESSAGE_MAP(BatteryStatusDispatcher, msg)
+    IPC_MESSAGE_HANDLER(BatteryStatusMsg_Updated, OnBatteryStatusUpdated)
+    IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP()
+  return handled;
+}
+
+void BatteryStatusDispatcher::startUpdating() {
+  Send(new BatteryStatusHostMsg_StartUpdating(routing_id()));
+  started_ = true;
+}
+
+void BatteryStatusDispatcher::stopUpdating() {
+  Send(new BatteryStatusHostMsg_StopUpdating(routing_id()));
+  started_ = false;
+}
+
+void BatteryStatusDispatcher::OnBatteryStatusUpdated(
+    const IPC::Message& message) {
+  const char* data;
+  int data_length;
+  PickleIterator iter(message);
+  if (message.ReadData(&iter, &data, &data_length)) {
+    const WebKit::WebBatteryStatus* web_status =
+        reinterpret_cast<const WebKit::WebBatteryStatus*>(data);
+    render_view()->GetWebView()->updateBatteryStatus(*web_status);
+  }
+}