diff -r 000000000000 -r 6474c204b198 addon-sdk/source/lib/sdk/view/core.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/addon-sdk/source/lib/sdk/view/core.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,27 @@
+/* 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";
+
+module.metadata = {
+  "stability": "unstable"
+};
+
+var { Ci } = require("chrome");
+var method = require("../../method/core");
+
+// Returns DOM node associated with a view for
+// the given `value`. If `value` has no view associated
+// it returns `null`. You can implement this method for
+// this type to define what the result should be for it.
+let getNodeView = method("getNodeView");
+getNodeView.define(x =>
+                     x instanceof Ci.nsIDOMNode ? x :
+                     x instanceof Ci.nsIDOMWindow ? x :
+                     null);
+exports.getNodeView = getNodeView;
+exports.viewFor = getNodeView;
+
+let getActiveView = method("getActiveView");
+exports.getActiveView = getActiveView;