Bug 1562050 - Quantumbar: When the history dropmarker is clicked, focus the input. r=dao

I don't really think this needs a test, but let me know if you think so.

Differential Revision: https://phabricator.services.mozilla.com/D36269

--HG--
extra : moz-landing-system : lando

browser/components/urlbar/UrlbarInput.jsm

@@ -1346,6 +1346,7 @@ class UrlbarInput {
       if (this.view.isOpen) {
         this.view.close();
       } else {
+        this.focus();
         this.startQuery({ allowAutofill: false });
       }
     }