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

chrome/browser/signin/fake_auth_status_provider.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_FAKE_AUTH_STATUS_PROVIDER_H_
+#define CHROME_BROWSER_SIGNIN_FAKE_AUTH_STATUS_PROVIDER_H_
+
+#include "chrome/browser/signin/signin_global_error.h"
+
+// Helper class that reports auth errors to SigninGlobalError. Automatically
+// registers and de-registers itself as an AuthStatusProvider in the
+// constructor and destructor.
+class FakeAuthStatusProvider : public SigninGlobalError::AuthStatusProvider {
+ public:
+  explicit FakeAuthStatusProvider(SigninGlobalError* error);
+  virtual ~FakeAuthStatusProvider();
+
+  // Sets the auth error that this provider reports to SigninGlobalError. Also
+  // notifies SigninGlobalError via AuthStatusChanged().
+  void SetAuthError(const GoogleServiceAuthError& error);
+
+  // AuthStatusProvider implementation.
+  virtual GoogleServiceAuthError GetAuthStatus() const OVERRIDE;
+
+ private:
+  SigninGlobalError* global_error_;
+  GoogleServiceAuthError auth_error_;
+};
+
+#endif  // CHROME_BROWSER_SIGNIN_FAKE_AUTH_STATUS_PROVIDER_H_