Add Active Directory login UI tests

chromeos/dbus/fake_auth_policy_client.h

 // 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 CHROMEOS_DBUS_FAKE_AUTH_POLICY_CLIENT_H_
 #define CHROMEOS_DBUS_FAKE_AUTH_POLICY_CLIENT_H_
 
 #include <string>
 
 #include "base/macros.h"
@@ skipping 21 matching lines @@
                         const AuthCallback& callback) override;
   void RefreshDevicePolicy(const RefreshPolicyCallback& calllback) override;
   void RefreshUserPolicy(const AccountId& account_id,
                          const RefreshPolicyCallback& callback) override;
 
   // Mark service as started. It's getting started by the
   // UpstartClient::StartAuthPolicyService on the Active Directory managed
   // devices.
   void set_started(bool started) { started_ = started; }
 
+  void set_auth_error(authpolicy::ErrorType auth_error) {
+    auth_error_ = auth_error;
+  }
+
  private:
   bool started_ = false;
+  authpolicy::ErrorType auth_error_ = authpolicy::ERROR_NONE;
   DISALLOW_COPY_AND_ASSIGN(FakeAuthPolicyClient);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_DBUS_FAKE_AUTH_POLICY_CLIENT_H_