Enable Google Drive offline mode automatically on first run.

chrome/browser/chromeos/first_run/drive_opt_in_controller.h

+// Copyright 2013 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_CHROMEOS_FIRST_RUN_DRIVE_OPT_IN_CONTROLLER_H_
+#define CHROME_BROWSER_CHROMEOS_FIRST_RUN_DRIVE_OPT_IN_CONTROLLER_H_
+
+#include "base/basictypes.h"
+#include "base/timer/timer.h"
+#include "chrome/browser/profiles/profile.h"
+
+namespace chromeos {
+
+class DriveOptInWebContentsManager;
+
+// This class is responsible for kicking off the Google Drive offline
+// initialization process. There is an initial delay to avoid contention when
+// the session starts. DriveOptInController will manage its own lifetime and
+// destroy itself when the opt-in succeeds or fails.
+class DriveOptInController {
+ public:
+  DriveOptInController();
+  virtual ~DriveOptInController();

[achuithb, 2013/11/01 19:25:15]

Should this method be virtual?

[Tim Song, 2013/11/02 00:13:14]

Done.

+
+  void StartOfflineOptIn();
+
+ private:
+  friend class DriveOptInWebContentsManager;

[achuithb, 2013/11/01 19:25:15]

Could we get rid of the friend relationship here, move
DriveOptInWebContentsManager to the anonymous namespace and just pass in a
callback for DriveOptInController::OnOptInDone(bool success)?

[Tim Song, 2013/11/02 00:13:14]

Done.

+
+  void OnOptInSuccess();
+  void OnOptInFailure();
+  void OnWebContentsTimedOut();
+  void CleanUp();
+
+  Profile* profile_;
+  scoped_ptr<DriveOptInWebContentsManager> web_contents_manager_;
+  base::OneShotTimer<DriveOptInController> web_contents_timer_;
+  base::OneShotTimer<DriveOptInController> initial_delay_timer_;
+  bool initial_delay_done_;
+
+  DISALLOW_COPY_AND_ASSIGN(DriveOptInController);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_FIRST_RUN_DRIVE_OPT_IN_CONTROLLER_H_