Add a SigninAllowed policy.

chrome/browser/ui/browser_command_controller.h

 // Copyright (c) 2012 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_BROWSER_COMMAND_CONTROLLER_H_
 #define CHROME_BROWSER_UI_BROWSER_COMMAND_CONTROLLER_H_
 
 #include "base/prefs/public/pref_change_registrar.h"
-#include "chrome/browser/api/sync/profile_sync_service_observer.h"
 #include "chrome/browser/command_updater.h"
 #include "chrome/browser/command_updater_delegate.h"
 #include "chrome/browser/profiles/profile_info_cache_observer.h"
 #include "chrome/browser/sessions/tab_restore_service_observer.h"
+#include "chrome/browser/signin/signin_pref_observer.h"
 #include "chrome/browser/ui/tabs/tab_strip_model_observer.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "ui/base/window_open_disposition.h"
 
 class Browser;
 class BrowserWindow;
 class Profile;
 class ProfileManager;
 
 namespace content {
 struct NativeWebKeyboardEvent;
 }
 
 namespace chrome {
 
 class BrowserCommandController : public CommandUpdaterDelegate,
                                  public content::NotificationObserver,
                                  public ProfileInfoCacheObserver,
+                                 public SigninPrefObserver,
                                  public TabStripModelObserver,
                                  public TabRestoreServiceObserver {
  public:
   BrowserCommandController(Browser* browser, ProfileManager* profile_manager);
   virtual ~BrowserCommandController();
 
   CommandUpdater* command_updater() { return &command_updater_; }
   bool block_command_execution() const { return block_command_execution_; }
 
   // Returns true if |command_id| is a reserved command whose keyboard shortcuts
@@ skipping 77 matching lines @@
                              content::WebContents* old_contents,
                              content::WebContents* new_contents,
                              int index) OVERRIDE;
   virtual void TabBlockedStateChanged(content::WebContents* contents,
                                       int index) OVERRIDE;
 
   // Overridden from TabRestoreServiceObserver:
   virtual void TabRestoreServiceChanged(TabRestoreService* service) OVERRIDE;
   virtual void TabRestoreServiceDestroyed(TabRestoreService* service) OVERRIDE;
 
+  // Overridden from SigninPrefObserver:
+  virtual void OnSigninAllowedPrefChange(bool signin_allowed) OVERRIDE;
+
   // Returns true if the regular Chrome UI (not the fullscreen one and
   // not the single-tab one) is shown. Used for updating window command states
   // only. Consider using SupportsWindowFeature if you need the mentioned
   // functionality anywhere else.
   bool IsShowingMainUI(bool is_fullscreen);
 
   // Initialize state for all browser commands.
   void InitCommandState();
 
   // Update commands whose state depends on incognito mode availability.
@@ skipping 67 matching lines @@
   content::NotificationRegistrar registrar_;
   PrefChangeRegistrar profile_pref_registrar_;
   PrefChangeRegistrar local_pref_registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserCommandController);
 };
 
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_UI_BROWSER_COMMAND_CONTROLLER_H_