1 files changed, 25 insertions, 0 deletions
diff --git a/addon-sdk/source/lib/framescript/util.js b/addon-sdk/source/lib/framescript/util.js
new file mode 100644
index 000000000..fb6834608
--- /dev/null
+++ b/addon-sdk/source/lib/framescript/util.js
@@ -0,0 +1,25 @@
+/* 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"
+};
+
+
+const { Ci } = require("chrome");
+
+const windowToMessageManager = window =>
+  window.
+    QueryInterface(Ci.nsIInterfaceRequestor).
+    getInterface(Ci.nsIDocShell).
+    sameTypeRootTreeItem.
+    QueryInterface(Ci.nsIDocShell).
+    QueryInterface(Ci.nsIInterfaceRequestor).
+    getInterface(Ci.nsIContentFrameMessageManager);
+exports.windowToMessageManager = windowToMessageManager;
+
+const nodeToMessageManager = node =>
+  windowToMessageManager(node.ownerDocument.defaultView);
+exports.nodeToMessageManager = nodeToMessageManager;