UMA Histograms for Register Promos

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 25 matching lines @@
     this.userInfo_ = userInfo;
 
     /**
      * Used to record usage statistics.
      * @type {!print_preview.Metrics}
      * @private
      */
     this.metrics_ = metrics;
 
     /**
+     * Whether or not a UMA histogram for the register promo being shown was
+     * already recorded.
+     * @type {bool}
+     * @private
+     */
+    this.registerPromoShownMetricRecorded_ = false;
+
+    /**
      * Search box used to search through the destination lists.
      * @type {!print_preview.SearchBox}
      * @private
      */
     this.searchBox_ = new print_preview.SearchBox();
     this.addChild(this.searchBox_);
 
     /**
      * Destination list containing recent destinations.
      * @type {!print_preview.DestinationList}
@@ skipping 259 matching lines @@
         } else {
           if (destination.connectionStatus ==
                 print_preview.Destination.ConnectionStatus.UNREGISTERED) {
             unregisteredCloudDestinations.push(destination);
           } else {
             cloudDestinations.push(destination);
           }
         }
       });
 
+      if (unregisteredCloudDestinations.length != 0 &&
+          !this.registerPromoShownMetricRecorded_) {
+        this.metrics_.incrementDestinationSearchBucket(
+          print_preview.Metrics.DestinationSearchBucket.REGISTER_PROMO_SHOWN);
+        this.registerPromoShownMetricRecorded_ = true;
+      }
+
       var finalCloudDestinations = unregisteredCloudDestinations.slice(
         0, DestinationSearch.MAX_PROMOTED_UNREGISTERED_PRINTERS_).concat(
           cloudDestinations,
           unregisteredCloudDestinations.slice(
             DestinationSearch.MAX_PROMOTED_UNREGISTERED_PRINTERS_));
 
       this.recentList_.updateDestinations(recentDestinations);
       this.localList_.updateDestinations(localDestinations);
       this.cloudList_.updateDestinations(finalCloudDestinations);
     },
@@ skipping 198 matching lines @@
     onWindowResize_: function() {
       this.reflowLists_();
     }
   };
 
   // Export
   return {
     DestinationSearch: DestinationSearch
   };
 });