Bug 1338195 - Define a frame-script environment for eslint and use it to clear no-undef issues for known frame script globals. r=mossop

MozReview-Commit-ID: Fcin4InbLK2

toolkit/components/aboutperformance/tests/browser/browser_aboutperformance.js

@@ -1,6 +1,8 @@
 /* Any copyright is dedicated to the Public Domain.
  * http://creativecommons.org/publicdomain/zero/1.0/ */
 
+/* eslint-env mozilla/frame-script */
+
 "use strict";
 
 Cu.import("resource://testing-common/ContentTask.jsm", this);