Add schema chrome-extension-resource:// for extension resources

chrome/test/data/extensions/api_test/accessible_cer/background.js

Index: chrome/test/data/extensions/api_test/accessible_cer/background.js
diff --git a/chrome/test/data/extensions/api_test/accessible_cer/background.js b/chrome/test/data/extensions/api_test/accessible_cer/background.js
new file mode 100644
index 0000000000000000000000000000000000000000..709c9d07aafa8af1de176ed4c3c814a33af7f1d4
--- /dev/null
+++ b/chrome/test/data/extensions/api_test/accessible_cer/background.js
@@ -0,0 +1,9 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+if (typeof(_demo) == 'undefined') {
+  chrome.test.fail();
+} else {
+  chrome.test.succeed();
+}