Allow signin to continue even if sync is disabled by policy.

chrome/browser/signin/signin_global_error.h

 // Copyright (c) 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_SIGNIN_SIGNIN_GLOBAL_ERROR_H_
 #define CHROME_BROWSER_SIGNIN_SIGNIN_GLOBAL_ERROR_H_
 
 #include <set>
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "chrome/browser/ui/global_error/global_error.h"
 #include "google_apis/gaia/google_service_auth_error.h"
 
 class Profile;
+class SigninManager;
 
 // Shows auth errors on the wrench menu using a bubble view and a
 // menu item. Services that wish to expose auth errors to the user should
 // register an AuthStatusProvider to report their current authentication state,
 // and should invoke AuthStatusChanged() when their authentication state may
 // have changed.
 class SigninGlobalError : public GlobalError {
  public:
   class AuthStatusProvider {
    public:
     AuthStatusProvider();
     virtual ~AuthStatusProvider();
 
     // API invoked by SigninGlobalError to get the current auth status of
     // the various signed in services.
     virtual GoogleServiceAuthError GetAuthStatus() const = 0;
   };
 
-  explicit SigninGlobalError(Profile* profile);
+  SigninGlobalError(SigninManager* signin_manager, Profile* profile);
   virtual ~SigninGlobalError();
 
   // Adds a provider which the SigninGlobalError object will start querying for
   // auth status.
   void AddProvider(const AuthStatusProvider* provider);
 
   // Removes a provider previously added by SigninGlobalError (generally only
   // called in preparation for shutdown).
   void RemoveProvider(const AuthStatusProvider* provider);
 
   // Invoked when the auth status of an AuthStatusProvider has changed.
   void AuthStatusChanged();
 
+  GoogleServiceAuthError GetLastAuthError() const { return auth_error_; }
+
   // GlobalError implementation.
   virtual bool HasBadge() OVERRIDE;
   virtual bool HasMenuItem() OVERRIDE;
   virtual int MenuItemCommandID() OVERRIDE;
   virtual string16 MenuItemLabel() OVERRIDE;
   virtual void ExecuteMenuItem(Browser* browser) OVERRIDE;
   virtual bool HasBubbleView() OVERRIDE;
   virtual string16 GetBubbleViewTitle() OVERRIDE;
   virtual string16 GetBubbleViewMessage() OVERRIDE;
   virtual string16 GetBubbleViewAcceptButtonLabel() OVERRIDE;
   virtual string16 GetBubbleViewCancelButtonLabel() OVERRIDE;
   virtual void OnBubbleViewDidClose(Browser* browser) OVERRIDE;
   virtual void BubbleViewAcceptButtonPressed(Browser* browser) OVERRIDE;
   virtual void BubbleViewCancelButtonPressed(Browser* browser) OVERRIDE;
 
  private:
   std::set<const AuthStatusProvider*> provider_set_;
 
   // The auth error detected the last time AuthStatusChanged() was invoked (or
   // NONE if AuthStatusChanged() has never been invoked).
   GoogleServiceAuthError auth_error_;
 
+  // The SigninManager that owns this object.
+  SigninManager* signin_manager_;
+
   // The Profile this object belongs to.
   Profile* profile_;
 };
 
 #endif  // CHROME_BROWSER_SIGNIN_SIGNIN_GLOBAL_ERROR_H_