Adding tests for USB extension API

chrome/test/data/extensions/api_test/usb/transfer_failure/test.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.
+
+var usb = chrome.experimental.usb;
+
+function createErrorTest(resultCode, errorMessage, name) {
+  return function() {
+    var handler = new Object();
+    handler.onEvent = (function (callback) {
+      return function (usbEvent) {
+        chrome.test.assertTrue(resultCode == usbEvent.resultCode);
+        chrome.test.assertTrue(errorMessage == usbEvent.error);
+        callback();
+      }
+    })(chrome.test.callbackAdded());
+
+    usb.findDevice(0, 0, handler, function(device) {
+      var transfer = new Object();
+      transfer.direction = "out";
+      transfer.endpoint = 1;
+      transfer.data = new ArrayBuffer(0);
+      usb.bulkTransfer(device, transfer);
+    });
+  };
+}
+
+var tests = [
+  createErrorTest(1, "Transfer failed"),
+  createErrorTest(2, "Transfer timed out"),
+];
+
+chrome.test.runTests(tests);