[Mac] User manager should show up as a standalone window.

chrome/browser/ui/cocoa/user_manager_mac.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_UI_COCOA_USER_MANAGER_MAC_H_
+#define CHROME_BROWSER_UI_COCOA_USER_MANAGER_MAC_H_
+
+#import <Cocoa/Cocoa.h>
+
+#include "base/mac/scoped_nsobject.h"
+#include "base/memory/scoped_ptr.h"
+#include "chrome/browser/profiles/profile.h"
+
+class UserManagerMac;
+@class UserManagerWindowController;
+
+namespace content {
+class NavigationController;
+class WebContents;
+}
+
+// Dialog widget that contains the Desktop User Manager webui.
+class UserManagerMac {
+ public:
+  // Shows the User Manager or re-activates an existing one, focusing the
+  // profile given by |profile_path_to_focus|.
+  static void Show(const base::FilePath& profile_path_to_focus);
+
+  // Hide the User Manager.
+  static void Hide();
+
+  // Returns whether or not the User Manager is showing.
+  static bool IsShowing();
+
+  // Called by the cocoa window controller when its window closes and the
+  // controller destroyed itself. Deletes the instance.
+  void WindowWasClosed();
+
+ private:
+  explicit UserManagerMac(Profile* profile);
+  virtual ~UserManagerMac();
+
+  // If the |guest_profile| has been initialized succesfully (according to
+  // |status|), creates a new UserManagerMac instance with the user with path
+  // |profile_path_to_focus| focused.
+  static void OnGuestProfileCreated(const base::FilePath& profile_path_to_focus,
+                                    Profile* guest_profile,
+                                    Profile::CreateStatus status);
+
+  // An open User Manager window. There can only be one open at a time. This
+  // is reset to NULL when the window is closed.
+  static UserManagerMac* instance_;  // Weak.
+
+  // Controller of the window.
+  base::scoped_nsobject<UserManagerWindowController> window_controller_;
+
+  DISALLOW_COPY_AND_ASSIGN(UserManagerMac);
+};
+
+#endif  // CHROME_BROWSER_UI_COCOA_USER_MANAGER_MAC_H_