first-run: Refactor Upgrade class into a common upgrade_util API.

chrome/browser/first_run/upgrade.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_FIRST_RUN_UPGRADE_H_
-#define CHROME_BROWSER_FIRST_RUN_UPGRADE_H_
-#pragma once
-
-#include "base/basictypes.h"
-#include "build/build_config.h"
-
-class CommandLine;
-
-#if defined(OS_WIN)
-class ProcessSingleton;
-#endif
-
-// This class contains the actions that need to be performed when an upgrade
-// is required. This involves mainly swapping the chrome exe and relaunching
-// the new browser.
-class Upgrade {
- public:
-#if defined(OS_WIN)
-  // Possible results of ShowTryChromeDialog().
-  enum TryResult {
-    TRY_CHROME,          // Launch chrome right now.
-    NOT_NOW,             // Don't launch chrome. Exit now.
-    UNINSTALL_CHROME,    // Initiate chrome uninstall and exit.
-    DIALOG_ERROR,        // An error occurred creating the dialog.
-    COUNT
-  };
-
-  // Check if current chrome.exe is already running as a browser process by
-  // trying to create a Global event with name same as full path of chrome.exe.
-  // This method caches the handle to this event so on subsequent calls also
-  // it can first close the handle and check for any other process holding the
-  // handle to the event.
-  static bool IsBrowserAlreadyRunning();
-
-  // If the new_chrome.exe exists (placed by the installer then is swapped
-  // to chrome.exe and the old chrome is renamed to old_chrome.exe. If there
-  // is no new_chrome.exe or the swap fails the return is false;
-  static bool SwapNewChromeExeIfPresent();
-
-  // Combines the two methods, RelaunchChromeBrowser and
-  // SwapNewChromeExeIfPresent, to perform the rename and relaunch of
-  // the browser. Note that relaunch does NOT exit the existing browser process.
-  // If this is called before message loop is executed, simply exit the main
-  // function. If browser is already running, you will need to exit it.
-  static bool DoUpgradeTasks(const CommandLine& command_line);
-
-  // Shows a modal dialog asking the user to give chrome another try. See
-  // above for the possible outcomes of the function. This is an experimental,
-  // non-localized dialog.
-  // |version| can be 0, 1 or 2 and selects what strings to present.
-  // |process_singleton| needs to be valid and it will be locked while
-  // the dialog is shown.
-  static TryResult ShowTryChromeDialog(size_t version,
-                                       ProcessSingleton* process_singleton);
-#endif  // OS_WIN
-
-  // Launches chrome again simulating a 'user' launch. If chrome could not
-  // be launched the return is false.
-  static bool RelaunchChromeBrowser(const CommandLine& command_line);
-
-#if defined(OS_LINUX) && !defined(OS_CHROMEOS)
-  static void SaveLastModifiedTimeOfExe();
-#endif
-
-  static void SetNewCommandLine(CommandLine* new_command_line) {
-    // Takes ownership of the pointer.
-    new_command_line_ = new_command_line;
-  }
-
-  // Launches a new instance of the browser if the current instance in
-  // persistent mode an upgrade is detected.
-  static void RelaunchChromeBrowserWithNewCommandLineIfNeeded();
-
-  // Windows:
-  //  Checks if chrome_new.exe is present in the current instance's install.
-  // Linux:
-  //  Checks if the last modified time of chrome is newer than that of the
-  //  current running instance.
-  static bool IsUpdatePendingRestart();
-
- private:
-#if defined(OS_LINUX) && !defined(OS_CHROMEOS)
-  static double GetLastModifiedTimeOfExe();
-  static double saved_last_modified_time_of_exe_;
-#endif
-  static CommandLine* new_command_line_;
-
-  DISALLOW_IMPLICIT_CONSTRUCTORS(Upgrade);
-};
-
-#endif  // CHROME_BROWSER_FIRST_RUN_UPGRADE_H_