Bluetooth API: add discovering changed events

chrome/test/data/extensions/api_test/bluetooth/test_events.js

 // 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.
 
-function testPowerEvents() {
+function testEvents() {
   chrome.test.assertEq(kExpectedValues.length, powerChangedValues.length);
   chrome.test.assertEq(kExpectedValues.length,
       availabilityChangedValues.length);
+  chrome.test.assertEq(kExpectedValues.length, discoveringChangedValues.length);
 
   for (var i = 0; i < kExpectedValues.length; ++i) {
     chrome.test.assertEq(kExpectedValues[i], powerChangedValues[i]);
     chrome.test.assertEq(kExpectedValues[i], availabilityChangedValues[i]);
+    chrome.test.assertEq(kExpectedValues[i], discoveringChangedValues[i]);
   }
 
   chrome.test.succeed();
 }
 
 var powerChangedValues = [];
 var availabilityChangedValues = [];
+var discoveringChangedValues = [];
 var kExpectedValues = [true, false];
 chrome.experimental.bluetooth.onPowerChanged.addListener(
     function(result) {
       powerChangedValues.push(result);
     });
 chrome.experimental.bluetooth.onAvailabilityChanged.addListener(
     function(result) {
       availabilityChangedValues.push(result);
     });
+chrome.experimental.bluetooth.onDiscoveringChanged.addListener(
+    function(result) {
+      discoveringChangedValues.push(result);
+    });
 chrome.test.sendMessage('ready',
     function(message) {
       chrome.test.runTests([
-          testPowerEvents
+          testEvents
       ]);
     });