Bug 1219882 - Add a 'save.1' probe for the 'Bookmark Link' web context menu r=margaret

mobile/android/chrome/content/browser.js

@@ -843,6 +843,7 @@ var BrowserApp = {
       NativeWindow.contextmenus._disableRestricted("BOOKMARK", NativeWindow.contextmenus.linkBookmarkableContext),
       function(aTarget) {
         UITelemetry.addEvent("action.1", "contextmenu", null, "web_bookmark");
+        UITelemetry.addEvent("save.1", "contextmenu", null, "bookmark");
 
         let url = NativeWindow.contextmenus._getLinkURL(aTarget);
         let title = aTarget.textContent || aTarget.title || url;