Introduce the devices Mojo app

device/devices_app/usb/public/interfaces/device.mojom

 // Copyright 2015 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.
 
 module device.usb;
 
 enum TransferDirection {
   IN,
   OUT,
 };
@@ skipping 243 matching lines @@
   // this transfer.
   //
   // |timeout| specifies the request timeout in milliseconds. A timeout of 0
   // indicates no timeout: the request will remain pending indefinitely until
   // completed or otherwise terminated.
   IsochronousTransferOut(uint8 endpoint_number,
                          array<array<uint8>> packets,
                          uint32 timeout)
       => (TransferStatus status);
 };