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_thread_impl.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebBatteryStatus.h"
+
+namespace content {
+
+BatteryStatusDispatcher::BatteryStatusDispatcher() {
+}
+
+BatteryStatusDispatcher::~BatteryStatusDispatcher() {
+  if (client_list_.size() > 0)
+    StopUpdates();
+}
+
+void BatteryStatusDispatcher::OnBatteryStatusUpdated(
+    const WebKit::WebBatteryStatus& battery_status) {
+  for (WebBatteryMonitorClientList::iterator iter = client_list_.begin();
+      iter != client_list_.end();
+      ++iter)
+    (*iter)->updateBatteryStatus(battery_status);
+}
+
+void BatteryStatusDispatcher::StopUpdates() {
+  RenderThreadImpl* thread = RenderThreadImpl::current();
+  thread->Send(new
+      BatteryStatusHostMsg_StopUpdating());
+}
+
+bool BatteryStatusDispatcher::OnControlMessageReceived(
+    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::start(WebKit::WebBatteryMonitorClient* client) {
+  client_list_.push_back(client);
+  if (client_list_.size() == 1) {
+    RenderThreadImpl* thread = RenderThreadImpl::current();
+    thread->Send(new
+        BatteryStatusHostMsg_StartUpdating());
+  }
+}
+
+void BatteryStatusDispatcher::stop(WebKit::WebBatteryMonitorClient* client) {
+  WebBatteryMonitorClientList::iterator find = std::find(client_list_.begin(),
+      client_list_.end(), client);
+  if (find == client_list_.end())
+    return;
+
+  client_list_.erase(find);
+  if (client_list_.size() == 0)
+    StopUpdates();
+}
+
+}  // namespace content