Add Active Directory login UI tests

chrome/browser/chromeos/settings/stub_install_attributes.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_CHROMEOS_SETTINGS_STUB_INSTALL_ATTRIBUTES_H_
 #define CHROME_BROWSER_CHROMEOS_SETTINGS_STUB_INSTALL_ATTRIBUTES_H_
 
 #include <string>
 
 #include "base/macros.h"
 #include "chrome/browser/chromeos/settings/install_attributes.h"
 #include "components/policy/core/common/cloud/cloud_policy_constants.h"
 
 namespace chromeos {
 
 // This class allows tests to set specific configurations for testing.
 class StubInstallAttributes : public InstallAttributes {
  public:
   StubInstallAttributes();
 
   // Setup as not-yet enrolled.
   void Clear();
 
   // Setup as consumer device.  (Clears existing configuration.)
   void SetConsumer();
 
   // Setup as enterprise enrolled.  (Clears existing configuration.)
   void SetEnterprise(const std::string& domain, const std::string& device_id);
 
+  void SetActiveDirectoryEnterprise(const std::string& realm);

[achuithb, 2017/03/07 15:07:04]

Function comment please.

[Roman Sorokin (ftl), 2017/03/07 16:32:05]

Done.

+
  private:
   DISALLOW_COPY_AND_ASSIGN(StubInstallAttributes);
 };
 
 // Helper class to set install attributes in the scope of a test.
 class ScopedStubInstallAttributes {
  public:
   ~ScopedStubInstallAttributes();
 
   // Factory for empty (unset) ScopedStubInstallAttributes.
   static ScopedStubInstallAttributes CreateUnset();
 
   // Factory for consumer-type ScopedStubInstallAttributes.
   static ScopedStubInstallAttributes CreateConsumer();
 
   // Factory for enterprise-type ScopedStubInstallAttributes.
   static ScopedStubInstallAttributes CreateEnterprise(
       const std::string& domain,
       const std::string& device_id);
 
+  static ScopedStubInstallAttributes CreateActiveDirectoryEnterprise(

[achuithb, 2017/03/07 15:07:04]

Function comment please

[Roman Sorokin (ftl), 2017/03/07 16:32:05]

Done.

+      const std::string& realm);
+
  private:
   ScopedStubInstallAttributes();
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_SETTINGS_STUB_INSTALL_ATTRIBUTES_H_