Add utilities to parse WebUSB device descriptors.

device/device_tests.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 63 matching lines @@
         'serial/serial_connection_unittest.cc',
         "serial/serial_io_handler_posix_unittest.cc",
         'serial/serial_service_unittest.cc',
         'test/run_all_unittests.cc',
         'test/usb_test_gadget_impl.cc',
         'usb/usb_context_unittest.cc',
         'usb/usb_device_filter_unittest.cc',
         'usb/usb_device_handle_unittest.cc',
         'usb/usb_ids_unittest.cc',
         'usb/usb_service_unittest.cc',
+        'usb/webusb_descriptors_unittest.cc',
       ],
       'conditions': [
         ['chromeos==1', {
           'dependencies': [
             '../build/linux/system.gyp:dbus',
             '../chromeos/chromeos.gyp:chromeos_test_support',
             '../chromeos/chromeos.gyp:chromeos_test_support_without_gmock',
             '../dbus/dbus.gyp:dbus',
           ],
           'sources!': [
@@ skipping 124 matching lines @@
             '../build/isolate.gypi',
           ],
           'sources': [
             'device_unittests.isolate',
           ]
         }
       ]
     }]
   ],
 }