Bug 1034295 - Add e10s support to shader editor. r=vp, r=jryans

browser/devtools/shared/frame-script-utils.js

@@ -0,0 +1,9 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+addMessageListener("devtools:test:history", function ({ data }) {
+  content.history[data.direction]();
+});