Help: Implement version updating on Win.

chrome/browser/ui/webui/help/version_updater_win.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_HELP_VERSION_UPDATER_WIN_H_
+#define CHROME_BROWSER_UI_WEBUI_HELP_VERSION_UPDATER_WIN_H_
+#pragma once
+
+#include "base/compiler_specific.h"
+#include "base/memory/ref_counted.h"
+#include "base/string16.h"
+#include "chrome/browser/google/google_update.h"
+#include "chrome/browser/ui/webui/help/version_updater.h"
+
+class VersionUpdaterWin : public VersionUpdater,
+                          public GoogleUpdateStatusListener {
+ protected:
+  friend class VersionUpdater;
+
+  // Clients must use VersionUpdater::Create().
+  VersionUpdaterWin();
+  virtual ~VersionUpdaterWin();
+
+ private:
+  // VersionUpdater implementation.
+  virtual void CheckForUpdate(const StatusCallback& callback) OVERRIDE;
+  virtual void RelaunchBrowser() const OVERRIDE;
+
+  // GoogleUpdateStatusListener implementation.
+  virtual void OnReportResults(GoogleUpdateUpgradeResult result,
+                               GoogleUpdateErrorCode error_code,
+                               const string16& error_message,
+                               const string16& version) OVERRIDE;
+
+  // Update the UI to show the status of the upgrade.
+  void UpdateStatus(GoogleUpdateUpgradeResult result,
+                    GoogleUpdateErrorCode error_code,
+                    const string16& error_message);
+
+  // The class that communicates with Google Update to find out if an update is
+  // available and asks it to start an upgrade.
+  scoped_refptr<GoogleUpdate> google_updater_;
+
+  // Callback used to communicate update status to the client.
+  StatusCallback callback_;
+
+  DISALLOW_COPY_AND_ASSIGN(VersionUpdaterWin);
+};
+
+#endif  // CHROME_BROWSER_UI_WEBUI_HELP_VERSION_UPDATER_WIN_H_