Override SigninManager::SignOut if force-signin is enabled.

chrome/browser/signin/force_signin_manager.h

Index: chrome/browser/signin/force_signin_manager.h
diff --git a/chrome/browser/signin/force_signin_manager.h b/chrome/browser/signin/force_signin_manager.h
new file mode 100644
index 0000000000000000000000000000000000000000..96555adedced8a37c8e5623dd0f02c065bc0b700
--- /dev/null
+++ b/chrome/browser/signin/force_signin_manager.h
@@ -0,0 +1,58 @@
+// Copyright 2016 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_SIGNIN_FORCE_SIGNIN_MANAGER_H_
+#define CHROME_BROWSER_SIGNIN_FORCE_SIGNIN_MANAGER_H_
+
+#include "components/signin/core/browser/signin_manager.h"
+
+namespace base {
+class FilePath;
+}  // namespace base
+
+class Profile;
+
+// Signin Manager when force signin is enabled.
+class ForceSigninManager : public SigninManager {
+ public:
+  ForceSigninManager(Profile* profile,
+                     SigninClient* client,
+                     ProfileOAuth2TokenService* token_service,
+                     AccountTrackerService* account_tracker_service,
+                     GaiaCookieManagerService* cookie_manager_service);
+  ~ForceSigninManager() override;
+
+  // Close all browser windows before signout. If user abort the closing, the
+  // signout will be aborted too.
+  void SignOut(signin_metrics::ProfileSignout signout_source_metric,
+               signin_metrics::SignoutDelete signout_delete_metric) override;
+
+  // Return true is force signin policy is enabled.
+  static bool IsForceSigninEnabled();
+
+  // Next signout won't open UserManager after all browser windows are closed.
+  static void DisableUserManagerDisplayForNextSignOut(
+      SigninManager* signin_manager);
+
+ protected:
+  // Signout and lock the profile.
+  virtual void DoSignOut(signin_metrics::ProfileSignout signout_source_metric,
+                         signin_metrics::SignoutDelete signout_delete_metric,
+                         const base::FilePath& profile_path);
+  // Show UserManager.
+  virtual void ShowUserManager(const base::FilePath& profile_path);
+
+ private:
+  // Callback after all browser windows are closed successfully.
+  void PostCloseBrowsers(signin_metrics::ProfileSignout signout_source_metric,
+                         signin_metrics::SignoutDelete signout_delete_metric,
+                         const base::FilePath& profile_path);
+
+  void SetIsUserManagerDisplayed(bool displayed);
+
+  Profile* profile_;
+  bool is_user_manager_displayed = true;
+};
+
+#endif  // CHROME_BROWSER_SIGNIN_FORCE_SIGNIN_MANAGER_H_