diff -r 000000000000 -r 6474c204b198 dom/audiochannel/tests/AudioChannelChromeScript.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/audiochannel/tests/AudioChannelChromeScript.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,18 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+const { classes: Cc, interfaces: Ci, results: Cr, utils: Cu } = Components;
+const { Services } = Cu.import('resource://gre/modules/Services.jsm');
+const { SystemAppProxy } = Cu.import('resource://gre/modules/SystemAppProxy.jsm');
+
+addMessageListener('init-chrome-event', function(message) {
+  // listen mozChromeEvent and forward to content process.
+  let type = message.type;
+
+  SystemAppProxy.addEventListener('mozChromeEvent', function(event) {
+    let details = event.detail;
+    if (details.type === type) {
+      sendAsyncMessage('chrome-event', details);
+    }
+  }, true);
+});