Add chrome.usb.listInterfaces API

chrome/test/data/extensions/api_test/usb_manual/list_interfaces/test.js

Index: chrome/test/data/extensions/api_test/usb_manual/list_interfaces/test.js
diff --git a/chrome/test/data/extensions/api_test/usb_manual/list_interfaces/test.js b/chrome/test/data/extensions/api_test/usb_manual/list_interfaces/test.js
new file mode 100644
index 0000000000000000000000000000000000000000..f9671a4bb2b6b528c1bca662d742d5119cd25948
--- /dev/null
+++ b/chrome/test/data/extensions/api_test/usb_manual/list_interfaces/test.js
@@ -0,0 +1,45 @@
+// 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.
+
+var usb = chrome.usb;
+
+var DEVICE_ID = {
+  // Google Nexus S
+  'vendorId': 6353,
+  'productId': 20194
+};
+
+var tests = [
+  function listInterfaces() {
+    chrome.permissions.request({
+        permissions: [{'usbDevices': [DEVICE_ID]}]
+    }, function(granted) {
+      if (!granted) {
+        chrome.test.fail('Could not get optional permisson');
+      } else {
+        usb.findDevices(DEVICE_ID, function(devices) {
+          if (typeof devices === 'undefined') {
+            chrome.test.fail('Device optional_permissions seem to be missing');
+          } else {
+            for (var i = 0; i < devices.length; i++) {
+              var device = devices[i];
+              console.log('device: ' + JSON.stringify(device));
+              usb.listInterfaces(device, function(result) {
+                if (typeof result !== 'object') {
+                  chrome.test.fail('should be object type. was: '
+                      + typeof result);
+                } else {
+                  console.log(JSON.stringify(result));
+                  chrome.test.succeed();
+                }
+              });
+            }
+          }
+        });
+      }
+    });
+  },
+];
+
+chrome.test.runTests(tests);