WebUSB bindings part 3

Source/modules/webusb/USBConfiguration.idl

+// 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.
+
+// http://reillyeon.github.io/webusb/#configurations
+
+[
+    Constructor(USBDevice device, octet configurationValue),
+    RaisesException=Constructor,
+    GarbageCollected,
+    RuntimeEnabled=WebUSB,
+] interface USBConfiguration {
+    readonly attribute octet configurationValue;
+    readonly attribute DOMString? configurationName;
+    readonly attribute sequence<USBInterface> interfaces;
+};