Add Active Directory login UI tests

chrome/browser/resources/chromeos/login/screen_gaia_signin.js

Index: chrome/browser/resources/chromeos/login/screen_gaia_signin.js
diff --git a/chrome/browser/resources/chromeos/login/screen_gaia_signin.js b/chrome/browser/resources/chromeos/login/screen_gaia_signin.js
index a4b4d24bafe99693eeb26a1c1f59ff65e4b142e6..dcac2c8ed33ac4e5140a98c05ad908d3dee2f619 100644
--- a/chrome/browser/resources/chromeos/login/screen_gaia_signin.js
+++ b/chrome/browser/resources/chromeos/login/screen_gaia_signin.js
@@ -1120,13 +1120,14 @@ login.createScreen('GaiaSigninScreen', 'gaia-signin', function() {
       this.updateControlsState();
     },
 
-    invalidateAd: function(username) {
+    invalidateAd: function(username, errorState) {

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

Where is this used in the test?

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

GaiaScreenHandler passes it depending on answer from FakeAuthPolicyClient

       if (this.screenMode_ != ScreenMode.AD_AUTH)
         return;
       var adAuthUI = this.getSigninFrame_();
       adAuthUI.setUser(username);
-      adAuthUI.setInvalid(ACTIVE_DIRECTORY_ERROR_STATE.BAD_PASSWORD);
+      adAuthUI.setInvalid(errorState);
       this.loading = false;
+      Oobe.getInstance().headerHidden = false;
     }
   };
 });