Help: Implement the initial version of the cross-platform help/about page.

chrome/browser/ui/webui/about_page/about_page_handler.h

-// 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.
-
-#ifndef CHROME_BROWSER_UI_WEBUI_ABOUT_PAGE_ABOUT_PAGE_HANDLER_H_
-#define CHROME_BROWSER_UI_WEBUI_ABOUT_PAGE_ABOUT_PAGE_HANDLER_H_
-
-#include <string>
-
-#include "base/compiler_specific.h"
-#include "chrome/browser/chromeos/dbus/update_engine_client.h"
-#include "chrome/browser/chromeos/version_loader.h"
-#include "content/public/browser/web_ui_message_handler.h"
-
-// ChromeOS about page UI handler.
-class AboutPageHandler : public content::WebUIMessageHandler {
- public:
-  AboutPageHandler();
-  virtual ~AboutPageHandler();
-
-  // WebUIMessageHandler implementation.
-  virtual void RegisterMessages() OVERRIDE;
-
-  // Fills |localized_strings| with string values for the UI.
-  void GetLocalizedValues(base::DictionaryValue* localized_strings);
-
- private:
-  class UpdateObserver;
-
-  // The function is called from JavaScript when the about page is ready.
-  void PageReady(const base::ListValue* args);
-
-  // The function is called from JavaScript to set the release track like
-  // "beta-channel" and "dev-channel".
-  void SetReleaseTrack(const base::ListValue* args);
-
-  // Initiates update check.
-  void CheckNow(const base::ListValue* args);
-
-  // Restarts the system.
-  void RestartNow(const base::ListValue* args);
-
-  // Callback from VersionLoader giving the version.
-  void OnOSVersion(chromeos::VersionLoader::Handle handle,
-                   std::string version);
-  void OnOSFirmware(chromeos::VersionLoader::Handle handle,
-                    std::string firmware);
-  void UpdateStatus(const chromeos::UpdateEngineClient::Status& status);
-
-  // UpdateEngine Callback handler.
-  static void UpdateSelectedChannel(UpdateObserver* observer,
-                                    const std::string& channel);
-
-  // Handles asynchronously loading the version.
-  chromeos::VersionLoader loader_;
-
-  // Used to request the version.
-  CancelableRequestConsumer consumer_;
-
-  // Update Observer
-  scoped_ptr<UpdateObserver> update_observer_;
-
-  int progress_;
-  bool sticky_;
-  bool started_;
-
-  DISALLOW_COPY_AND_ASSIGN(AboutPageHandler);
-};
-
-#endif  // CHROME_BROWSER_UI_WEBUI_ABOUT_PAGE_ABOUT_PAGE_HANDLER_H_