[usb_gadget p13] Replace LUFA with UsbTestGadget in HidConnection tests.

tools/usb_gadget/__main__.py

 # Copyright 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.
 
 """Package entry-point."""
 
 import argparse
 
 import netifaces
 from tornado import ioloop
 
+import hid_echo_gadget
 import keyboard_gadget
 import linux_gadgetfs
 import mouse_gadget
 import server
 
 
 def ParseArgs():
   """Parse application arguments."""
   parser = argparse.ArgumentParser(description='USB gadget server.')
   parser.add_argument(
@@ skipping 19 matching lines @@
   server.hardware = args.hardware
   server.claimed_by = args.start_claimed
 
   addrs = netifaces.ifaddresses(server.interface)
   ip_address = addrs[netifaces.AF_INET][0]['addr']
   server.address = '{}:{}'.format(ip_address, server.port)
 
   server.chip = linux_gadgetfs.LinuxGadgetfs(server.hardware)
   server.SwitchGadget(server.default)
 
+  hid_echo_gadget.RegisterHandlers()
   keyboard_gadget.RegisterHandlers()
   mouse_gadget.RegisterHandlers()
 
   server.http_server.listen(server.port)
 
   ioloop.IOLoop.instance().start()
   print 'Exiting...'
 
 
 if __name__ == '__main__':
   main()