Bluetooth: add Device events, and cleanup JS API

chrome/test/data/extensions/api_test/bluetooth/device_events/runtest.js

+// Copyright (c) 2014 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.
+
+var kExpectedDeviceNames = {
+  "21:22:23:24:25:26": "the real d2",
+  "31:32:33:34:35:36": "d3"
+};
+
+function testDeviceEvents() {
+  var expectedAddresses = Object.keys(kExpectedDeviceNames);
+  chrome.test.assertEq(expectedAddresses.length, Object.keys(devices).length);
+
+  for (var i = 0; i < expectedAddresses.length; ++i) {
+    var address = expectedAddresses[i];
+    chrome.test.assertTrue(address in devices);
+    chrome.test.assertEq(kExpectedDeviceNames[address], devices[address].name);
+  }
+
+  chrome.test.succeed();
+}
+
+function startTests() {
+  chrome.test.runTests([testDeviceEvents]);
+}
+
+var devices = {};
+function recordDevice(device) {
+  devices[device.address] = device;
+}
+function removeDevice(device) {
+  delete devices[device.address];
+  chrome.test.sendMessage('ready', startTests);
+}
+
+function stopDiscoveryAndContinue() {
+  chrome.bluetooth.stopDiscovery();
+  chrome.bluetooth.onDeviceAdded.removeListener(recordDevice);
+  sendReady(startTests);
+}
+
+chrome.bluetooth.onDeviceAdded.addListener(recordDevice);
+chrome.bluetooth.onDeviceChanged.addListener(recordDevice);
+chrome.bluetooth.onDeviceRemoved.addListener(removeDevice);