diff -r 000000000000 -r 6474c204b198 dom/media/tests/mochitest/NetworkPreparationChromeScript.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/media/tests/mochitest/NetworkPreparationChromeScript.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,65 @@
+/* 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');
+
+var browser = Services.wm.getMostRecentWindow('navigator:browser');
+var connection = browser.navigator.mozMobileConnections[0];
+
+// provide a fake APN and enable data connection.
+function enableDataConnection() {
+  let setLock = browser.navigator.mozSettings.createLock();
+  setLock.set({
+    'ril.data.enabled': true,
+    'ril.data.apnSettings': [
+      [
+        {'carrier':'T-Mobile US',
+         'apn':'epc.tmobile.com',
+         'mmsc':'http://mms.msg.eng.t-mobile.com/mms/wapenc',
+         'types':['default','supl','mms']}
+      ]
+    ]
+  });
+}
+
+// enable 3G radio
+function enableRadio() {
+  if (connection.radioState !== 'enabled') {
+    connection.setRadioEnabled(true);
+  }
+}
+
+// disable 3G radio
+function disableRadio() {
+  if (connection.radioState === 'enabled') {
+    connection.setRadioEnabled(false);
+  }
+}
+
+addMessageListener('prepare-network', function(message) {
+  //RIL DOM events will be pending until RIL receiveing system-message-listener-ready event.
+  Services.obs.notifyObservers(null, 'system-message-listener-ready', null);
+
+  connection.addEventListener('datachange', function onDataChange() {
+    if (connection.data.connected) {
+      connection.removeEventListener('datachange', onDataChange);
+      Services.prefs.setIntPref('network.proxy.type', 2);
+      sendAsyncMessage('network-ready', true);
+    }
+  });
+
+  enableRadio();
+  enableDataConnection();
+});
+
+addMessageListener('network-cleanup', function(message) {
+  connection.addEventListener('datachange', function onDataChange() {
+    if (!connection.data.connected) {
+      connection.removeEventListener('datachange', onDataChange);
+      Services.prefs.setIntPref('network.proxy.type', 2);
+      sendAsyncMessage('network-disabled', true);
+    }
+  });
+  disableRadio();
+});