Show spinner for constrained signin flow

chrome/browser/resources/inline_login/inline_login.js

Index: chrome/browser/resources/inline_login/inline_login.js
diff --git a/chrome/browser/resources/inline_login/inline_login.js b/chrome/browser/resources/inline_login/inline_login.js
index 44dc44bd0327bdbb4f415f410167a197e363596f..ebcc4dcee34c3404911700c2dfee866dfd391b32 100644
--- a/chrome/browser/resources/inline_login/inline_login.js
+++ b/chrome/browser/resources/inline_login/inline_login.js
@@ -56,7 +56,8 @@ cr.define('inline.login', function() {
   function loadAuthExtension(data) {
     authExtHost.load(data.authMode, data, onAuthCompleted);
     $('contents').classList.toggle('loading',
-        data.authMode != cr.login.GaiaAuthHost.AuthMode.DESKTOP);
+        data.authMode != cr.login.GaiaAuthHost.AuthMode.DESKTOP ||

[xiyuan, 2014/06/17 22:58:14]

What does this do? Is it turning off the spinner when authMode ==
AuthMode.DESKTOP? Should we replace the test with "true" to show spinner in all
cases?

[guohui, 2014/06/18 18:44:04]

this is to turn off spinner for full tab signin on desktop. With spinner, the
gaia iframe is initially invisible and thus has 0 height and and since gaia
tries to position the scroll bar based on the frame height thus the page would
scroll to the bottom unexpectedly. 

+        data.constrained == '1');
   }
 
   /**