Assign unique partition ID to gaia webview

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 c0364e8543a014d23320904ba06c5637169613e4..6b413e6ff0a67eae6b43d29abd4c8c881d21f70e 100644
--- a/chrome/browser/resources/gaia_auth/main.js
+++ b/chrome/browser/resources/gaia_auth/main.js
@@ -56,6 +56,7 @@ Authenticator.prototype = {
         this.continueUrl_.substring(0, this.continueUrl_.indexOf('?')) ||
         this.continueUrl_;
     this.inlineMode_ = params.inlineMode;
+    this.partitionId_ = params.partitionId || '';
 
     document.addEventListener('DOMContentLoaded', this.onPageLoad.bind(this));
     document.addEventListener('enableSAML', this.onEnableSAML_.bind(this));
@@ -128,6 +129,7 @@ Authenticator.prototype = {
 
   loadFrame_: function() {
     var gaiaFrame = $('gaia-frame');
+    gaiaFrame.partition = this.partitionId_;

[lazyboy, 2013/11/04 21:08:29]

I'm wondering since partitionId_ is an increasing sequence, could we end up in a
case where:
You load account A in a webview
then load account B in webview
and then load account A again
Would the third load have different partitionId_ than first load? I'm not
entirely sure if this is a possible scenario though. If it is possible, would
that be a problem that account A has two different storage?

[guohui, 2013/11/05 14:35:36]

this is ok. In our use case, we always want a clean cookie jar, regardless of
which account the user picks.

     gaiaFrame.src = this.getFrameUrl_();
     if (this.inlineMode_) {
       gaiaFrame.addEventListener(