Refactor UpgradeDetector.

chrome/browser/upgrade_detector_impl.h

+// Copyright (c) 2011 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_UPGRADE_DETECTOR_IMPL_H_
+#define CHROME_BROWSER_UPGRADE_DETECTOR_IMPL_H_
+#pragma once
+
+#include "base/timer.h"
+#include "chrome/browser/upgrade_detector.h"
+
+template <typename T> struct DefaultSingletonTraits;
+
+class UpgradeDetectorImpl : public UpgradeDetector {
+ public:
+  virtual ~UpgradeDetectorImpl();
+
+  // Returns the singleton instance.
+  static UpgradeDetectorImpl* GetInstance();
+
+ private:
+  friend struct DefaultSingletonTraits<UpgradeDetectorImpl>;
+
+  UpgradeDetectorImpl();
+
+  // Launches a task on the file thread to check if we have the latest version.
+  void CheckForUpgrade();
+
+  // Sends out a notification and starts a one shot timer to wait until
+  // notifying the user.
+  void UpgradeDetected();
+
+  // The function that sends out a notification (after a certain time has
+  // elapsed) that lets the rest of the UI know we should start notifying the
+  // user that a new version is available.
+  void NotifyOnUpgrade();
+
+  // We periodically check to see if Chrome has been upgraded.
+  base::RepeatingTimer<UpgradeDetectorImpl> detect_upgrade_timer_;
+
+  // After we detect an upgrade we start a recurring timer to see if enough time
+  // has passed and we should start notifying the user.
+  base::RepeatingTimer<UpgradeDetectorImpl> upgrade_notification_timer_;
+
+  // We use this factory to create callback tasks for UpgradeDetected. We pass
+  // the task to the actual upgrade detection code, which is in
+  // DetectUpgradeTask.
+  ScopedRunnableMethodFactory<UpgradeDetectorImpl> method_factory_;
+
+  // True if this build is a dev or canary channel build.
+  bool is_unstable_channel_;
+
+  DISALLOW_COPY_AND_ASSIGN(UpgradeDetectorImpl);
+};
+
+
+#endif  // CHROME_BROWSER_UPGRADE_DETECTOR_IMPL_H_