Add UMA stats for new Print Preview UI elements.

chrome/browser/resources/print_preview/search/destination_search.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.
 
 cr.define('print_preview', function() {
   'use strict';
 
   /**
    * Component used for searching for a print destination.
    * This is a modal dialog that allows the user to search and select a
@@ skipping 441 matching lines @@
     },
 
     /**
      * Updates printer sharing invitations UI.
      * @private
      */
     updateInvitations_: function() {
       var invitations = this.userInfo_.activeUser ?
           this.invitationStore_.invitations(this.userInfo_.activeUser) : [];
       if (invitations.length > 0) {
+        if (this.invitation_ != invitations[0]) {
+          this.metrics_.record(print_preview.Metrics.DestinationSearchBucket.
+              INVITATION_AVAILABLE);
+        }
         this.invitation_ = invitations[0];
         this.showInvitation_(this.invitation_);
       } else {
         this.invitation_ = null;
       }
       setIsVisible(
           this.getChildElement('.invitation-container'), !!this.invitation_);
       this.reflowLists_();
     },
 
@@ skipping 182 matching lines @@
             print_preview.Metrics.DestinationSearchBucket.ADD_ACCOUNT_SELECTED);
       }
     },
 
     /**
      * Called when the printer sharing invitation Accept/Reject button is
      * clicked.
      * @private
      */
     onInvitationProcessButtonClick_: function(accept) {
+      this.metrics_.record(accept ?
+          print_preview.Metrics.DestinationSearchBucket.INVITATION_ACCEPTED :
+          print_preview.Metrics.DestinationSearchBucket.INVITATION_REJECTED);
       this.invitationStore_.processInvitation(this.invitation_, accept);
       this.updateInvitations_();
     },
 
     /**
      * Called when the close button on the cloud print promo is clicked. Hides
      * the promo.
      * @private
      */
     onCloudprintPromoCloseButtonClick_: function() {
       setIsVisible(this.getChildElement('.cloudprint-promo'), false);
     },
 
     /**
      * Called when the window is resized. Reflows layout of destination lists.
      * @private
      */
     onWindowResize_: function() {
       this.reflowLists_();
     }
   };
 
   // Export
   return {
     DestinationSearch: DestinationSearch
   };
 });