Assign unique partition ID to gaia webview

chrome/browser/resources/gaia_auth/main.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * Authenticator class wraps the communications between Gaia and its host.
  */
 function Authenticator() {
 }
 
@@ skipping 38 matching lines @@
     this.parentPage_ = params.parentPage || this.PARENT_PAGE;
     this.gaiaUrl_ = params.gaiaUrl || this.GAIA_URL;
     this.inputLang_ = params.hl;
     this.inputEmail_ = params.email;
     this.service_ = params.service || this.SERVICE_ID;
     this.continueUrl_ = params.continueUrl || this.CONTINUE_URL;
     this.continueUrlWithoutParams_ =
         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));
   },
 
   isGaiaMessage_: function(msg) {
     // Not quite right, but good enough.
     return this.gaiaUrl_.indexOf(msg.origin) == 0 ||
            this.GAIA_URL.indexOf(msg.origin) == 0;
   },
@@ skipping 52 matching lines @@
   /**
    * Callback when the gaia webview attempts to open a new window.
   */
   onWebviewNewWindow_: function(gaiaFrame, e) {
     window.open(e.targetUrl, '_blank');
     e.window.discard();
   },
 
   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(
           'loadstop', this.onWebviewLoadstop_.bind(this, gaiaFrame));
       gaiaFrame.addEventListener(
           'newwindow', this.onWebviewNewWindow_.bind(this, gaiaFrame));
     }
   },
 
   completeLogin: function(username, password) {
@@ skipping 110 matching lines @@
     } else if (msg.method == 'navigate' &&
                this.isParentMessage_(e)) {
        $('gaia-frame').src = msg.src;
     } else {
       console.error('Authenticator.onMessage: unknown message + origin!?');
     }
   }
 };
 
 Authenticator.getInstance().initialize();