Fix focus loss on chrome signin page

chrome/browser/resources/gaia_auth/main.js

Index: chrome/browser/resources/gaia_auth/main.js
diff --git a/chrome/browser/resources/gaia_auth/main.js b/chrome/browser/resources/gaia_auth/main.js
index bb349f3bde5d2435a34a4a8878e5ed9e7f0aa1a6..5e4d6dbf0c786c9897716ccdae18e30ef2bbd003 100644
--- a/chrome/browser/resources/gaia_auth/main.js
+++ b/chrome/browser/resources/gaia_auth/main.js
@@ -231,7 +231,11 @@ Authenticator.prototype = {
     };
     window.parent.postMessage(msg, this.parentPage_);
     if (this.inlineMode_) {
-      $('gaia-frame').focus();
+      var gaiaFrame = $('gaia-frame');
+      gaiaFrame.focus();
+      gaiaFrame.onblur = function() {
+        gaiaFrame.focus();

[xiyuan, 2014/01/07 21:49:48]

Would this has side effect? e.g. what happens user click on omnibox or click
another browser window?

[guohui, 2014/01/07 22:15:02]

the only side effect i have observed is that upon switching back from another
window, the focused element may flicker once as it is refocused. I think it
should be ok as a temporary workaround until webview team fixes the root cause
on their side, TODO added.

+      };
     }
     this.loaded_ = true;
   },