UMA Histograms for Register Promos

chrome/browser/resources/print_preview/search/destination_search.js

Index: chrome/browser/resources/print_preview/search/destination_search.js
diff --git a/chrome/browser/resources/print_preview/search/destination_search.js b/chrome/browser/resources/print_preview/search/destination_search.js
index a0a2857d7683d3a88c09041f53377909a40d3d58..7ec38032d9a9a2af2c14242f455759c2737f1077 100644
--- a/chrome/browser/resources/print_preview/search/destination_search.js
+++ b/chrome/browser/resources/print_preview/search/destination_search.js
@@ -43,6 +43,14 @@ cr.define('print_preview', function() {
     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
@@ -322,6 +330,13 @@ cr.define('print_preview', function() {
         }
       });
 
+      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,