Fix focus loss on chrome signin page

BUG=331733

Review URL: https://codereview.chromium.org/125863003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243651 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/resources/gaia_auth/main.js

@@ -231,7 +231,13 @@ Authenticator.prototype = {
     };
     window.parent.postMessage(msg, this.parentPage_);
     if (this.inlineMode_) {
-      $('gaia-frame').focus();
+      // TODO(guohui): temporary workaround until webview team fixes the focus
+      // on their side.
+      var gaiaFrame = $('gaia-frame');
+      gaiaFrame.focus();
+      gaiaFrame.onblur = function() {
+        gaiaFrame.focus();
+      };
     }
     this.loaded_ = true;
   },