don't display platform app resources in normal browser windows

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

Index: chrome/test/data/extensions/api_test/push_messaging/background.js
diff --git a/chrome/test/data/extensions/api_test/push_messaging/background.js b/chrome/test/data/extensions/api_test/push_messaging/background.js
index 9e8503f247ced65188ba3a14355d5b5e139b8c0c..8c81771924217e458e6936b438f9069a485f7f3c 100644
--- a/chrome/test/data/extensions/api_test/push_messaging/background.js
+++ b/chrome/test/data/extensions/api_test/push_messaging/background.js
@@ -2,3 +2,15 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+function verifyDetails(details) {
+  chrome.test.assertEq(1, details.subchannelId);
+  chrome.test.assertEq("payload", details.payload);
+}
+
+function testEventDispatch() {
+  chrome.experimental.pushMessaging.onMessage.addListener(
+      chrome.test.callbackPass(verifyDetails));
+  chrome.test.sendMessage('ready');
+}
+
+chrome.test.runTests([testEventDispatch]);