Added ActivityLog tests and associated bugfixes/extra logging.

chrome/test/data/extensions/activity_log_app/background.js

 // Copyright (c) 2013 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.
-
 function recordDevice(device) {
   console.log("recordDevice");
 }
 
 chrome.app.runtime.onLaunched.addListener(function() {
   chrome.app.window.create('window.html', {'width': 400,'height': 500});
   chrome.bluetooth.startDiscovery({deviceCallback: recordDevice});
   chrome.bluetooth.stopDiscovery();
 });
+
+chrome.runtime.onMessageExternal.addListener(
+    function(message, sender, response) {
+  response();
+});
+
+chrome.runtime.onConnectExternal.addListener(function(port) {
+  console.log("connected");
+});