cros: Fix API 'add' password and complete auth racing

chrome/browser/resources/gaia_auth_host/saml_handler.js

 // Copyright 2015 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.
 
 <include src="post_message_channel.js">
 
 /**
  * @fileoverview Saml support for webview based auth.
  */
 
@@ skipping 413 matching lines @@
 
       if (call.method == 'add') {
         if (API_KEY_TYPES.indexOf(call.keyType) == -1) {
           console.error('SamlHandler.onAPICall_: unsupported key type');
           return;
         }
         // Not setting |email_| and |gaiaId_| because this API call will
         // eventually be followed by onCompleteLogin_() which does set it.
         this.apiToken_ = call.token;
         this.apiPasswordBytes_ = call.passwordBytes;
+
+        this.dispatchEvent(new CustomEvent('apiPasswordAdded'));
       } else if (call.method == 'confirm') {
         if (call.token != this.apiToken_)
           console.error('SamlHandler.onAPICall_: token mismatch');
       } else {
         console.error('SamlHandler.onAPICall_: unknown message');
       }
     },
 
     onUpdatePassword_: function(channel, msg) {
       if (this.isSamlPage_)
@@ skipping 20 matching lines @@
 
     onGetSAMLFlag_: function(channel, msg) {
       return this.isSamlPage_;
     },
   };
 
   return {
     SamlHandler: SamlHandler
   };
 });