Track USB device configuration state in Blink.

third_party/WebKit/LayoutTests/usb/resources/fake-devices.js

 'use strict';
 
 function fakeUsbDevices() {
   return define('Fake USB Devices', [
     'device/usb/public/interfaces/device.mojom',
   ], device => Promise.resolve([
     {
       guid: 'CD9FA048-FC9B-7A71-DBFC-FD44B78D6397',
       usb_version_major: 2,
       usb_version_minor: 0,
       usb_version_subminor: 0,
       class_code: 7,
       subclass_code: 1,
       protocol_code: 2,
       vendor_id: 0x18d1,
       product_id: 0xf00d,
       device_version_major: 1,
       device_version_minor: 2,
       device_version_subminor: 3,
       manufacturer_name: 'Google, Inc.',
       product_name: 'The amazing imaginary printer',
       serial_number: '4',
+      active_configuration: 0,
       configurations: [
         {
           configuration_value: 1,
           configuration_name: 'Printer Mode',
           interfaces: [
             {
               interface_number: 0,
               alternates: [
                 {
                   alternate_setting: 0,
@@ skipping 78 matching lines @@
                 }
               ]
             },
           ]
         }
       ],
       webusb_allowed_origins: { origins: [], configurations: [] },
     }
   ]));
 }