Bug 1220556 - No feedback after performing Copy link. r=margaret

--HG--
extra : transplant_source : A%28%D2%3D%DD%0C%C0%84%A0%FF%8EX%8B%23R%BE%10%E8o%93

mobile/android/chrome/content/browser.js

@@ -3117,6 +3117,7 @@ var NativeWindow = {
     _copyStringToDefaultClipboard: function(aString) {
       let clipboard = Cc["@mozilla.org/widget/clipboardhelper;1"].getService(Ci.nsIClipboardHelper);
       clipboard.copyString(aString);
+      NativeWindow.toast.show(Strings.browser.GetStringFromName("selectionHelper.textCopied"), "short");
     },
 
     _stripScheme: function(aString) {