Add UMA metrics for "Cast..." menu item.

chrome/browser/ui/toolbar/app_menu_model.cc

Index: chrome/browser/ui/toolbar/app_menu_model.cc
diff --git a/chrome/browser/ui/toolbar/app_menu_model.cc b/chrome/browser/ui/toolbar/app_menu_model.cc
index 07038112691ad15417dad0b758abe9942e11209e..42a7e060223cf482ad05302ddf4b2a0a7dd1b3b0 100644
--- a/chrome/browser/ui/toolbar/app_menu_model.cc
+++ b/chrome/browser/ui/toolbar/app_menu_model.cc
@@ -480,6 +480,12 @@ void AppMenuModel::LogMenuMetrics(int command_id) {
       LogMenuAction(MENU_ACTION_PRINT);
       break;
 
+    case IDC_ROUTE_MEDIA:
+      if (!uma_action_recorded_)
+        UMA_HISTOGRAM_MEDIUM_TIMES("WrenchMenu.TimeToAction.Cast", delta);
+      LogMenuAction(MENU_ACTION_CAST);
+      break;
+
     // Edit menu.
     case IDC_CUT:
       if (!uma_action_recorded_)