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diff --git a/devtools/client/shadereditor/panel.js b/devtools/client/shadereditor/panel.js
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+/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* vim: set ft=javascript ts=2 et sw=2 tw=80: */
+/* 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";
+
+const { Cc, Ci, Cu, Cr } = require("chrome");
+const promise = require("promise");
+const EventEmitter = require("devtools/shared/event-emitter");
+const { WebGLFront } = require("devtools/shared/fronts/webgl");
+const DevToolsUtils = require("devtools/shared/DevToolsUtils");
+
+function ShaderEditorPanel(iframeWindow, toolbox) {
+ this.panelWin = iframeWindow;
+ this._toolbox = toolbox;
+ this._destroyer = null;
+
+ EventEmitter.decorate(this);
+}
+
+exports.ShaderEditorPanel = ShaderEditorPanel;
+
+ShaderEditorPanel.prototype = {
+ /**
+ * Open is effectively an asynchronous constructor.
+ *
+ * @return object
+ * A promise that is resolved when the Shader Editor completes opening.
+ */
+ open: function () {
+ let targetPromise;
+
+ // Local debugging needs to make the target remote.
+ if (!this.target.isRemote) {
+ targetPromise = this.target.makeRemote();
+ } else {
+ targetPromise = promise.resolve(this.target);
+ }
+
+ return targetPromise
+ .then(() => {
+ this.panelWin.gToolbox = this._toolbox;
+ this.panelWin.gTarget = this.target;
+ this.panelWin.gFront = new WebGLFront(this.target.client, this.target.form);
+ return this.panelWin.startupShaderEditor();
+ })
+ .then(() => {
+ this.isReady = true;
+ this.emit("ready");
+ return this;
+ })
+ .then(null, function onError(aReason) {
+ DevToolsUtils.reportException("ShaderEditorPanel.prototype.open", aReason);
+ });
+ },
+
+ // DevToolPanel API
+
+ get target() {
+ return this._toolbox.target;
+ },
+
+ destroy: function () {
+ // Make sure this panel is not already destroyed.
+ if (this._destroyer) {
+ return this._destroyer;
+ }
+
+ return this._destroyer = this.panelWin.shutdownShaderEditor().then(() => {
+ // Destroy front to ensure packet handler is removed from client
+ this.panelWin.gFront.destroy();
+ this.emit("destroyed");
+ });
+ }
+};