Creates GCP promo for ChromeOS users with no cloud printers.

chrome/browser/ui/webui/print_preview/print_preview_handler.cc

Index: chrome/browser/ui/webui/print_preview/print_preview_handler.cc
diff --git a/chrome/browser/ui/webui/print_preview/print_preview_handler.cc b/chrome/browser/ui/webui/print_preview/print_preview_handler.cc
index 3ce3bd3ce913ad1bca88aa860b16a156c1c9339e..0ace322db714f65ad5f4878111dc689ce7988c56 100644
--- a/chrome/browser/ui/webui/print_preview/print_preview_handler.cc
+++ b/chrome/browser/ui/webui/print_preview/print_preview_handler.cc
@@ -105,6 +105,7 @@ enum PrintSettingsBuckets {
 
 enum UiBucketGroups {
   DESTINATION_SEARCH,
+  GCP_PROMO,
   UI_BUCKET_GROUP_BOUNDARY
 };
 
@@ -117,6 +118,13 @@ enum PrintDestinationBuckets {
   PRINT_DESTINATION_BUCKET_BOUNDARY
 };
 
+enum GcpPromoBuckets {
+  PROMO_SHOWN,
+  PROMO_CLOSED,
+  PROMO_CLICKED,
+  GCP_PROMO_BUCKET_BOUNDARY
+};
+
 void ReportUserActionHistogram(enum UserActionBuckets event) {
   UMA_HISTOGRAM_ENUMERATION("PrintPreview.UserAction", event,
                             USERACTION_BUCKET_BOUNDARY);
@@ -132,6 +140,11 @@ void ReportPrintDestinationHistogram(enum PrintDestinationBuckets event) {
                             PRINT_DESTINATION_BUCKET_BOUNDARY);
 }
 
+void ReportGcpPromoHistogram(enum GcpPromoBuckets event) {
+  UMA_HISTOGRAM_ENUMERATION("PrintPreview.GcpPromo", event,
+                            GCP_PROMO_BUCKET_BOUNDARY);
+}
+
 // Name of a dictionary field holding cloud print related data;
 const char kAppState[] = "appState";
 // Name of a dictionary field holding the initiator tab title.
@@ -705,12 +718,20 @@ void PrintPreviewHandler::HandleReportUiEvent(const ListValue* args) {
   switch (ui_bucket_group) {
     case DESTINATION_SEARCH: {
       enum PrintDestinationBuckets event =
-            static_cast<enum PrintDestinationBuckets>(event_number);
+          static_cast<enum PrintDestinationBuckets>(event_number);
       if (event >= PRINT_DESTINATION_BUCKET_BOUNDARY)
         return;
       ReportPrintDestinationHistogram(event);
       break;
     }
+    case GCP_PROMO: {
+      enum GcpPromoBuckets event =
+          static_cast<enum GcpPromoBuckets>(event_number);
+      if (event >= GCP_PROMO_BUCKET_BOUNDARY)
+        return;
+      ReportGcpPromoHistogram(event);
+      break;
+    }
     default:
       break;
   }