Add WebUSB bindings and client interface [part 1]

Source/modules/webusb/USBDeviceFilter.idl

Index: Source/modules/webusb/USBDeviceFilter.idl
diff --git a/Source/modules/webusb/USBDeviceFilter.idl b/Source/modules/webusb/USBDeviceFilter.idl
new file mode 100644
index 0000000000000000000000000000000000000000..541fefae5270988511a96fa7bf0c0ca7e9d57d71
--- /dev/null
+++ b/Source/modules/webusb/USBDeviceFilter.idl
@@ -0,0 +1,13 @@
+// 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/#device-enumeration
+
+dictionary USBDeviceFilter {
+    unsigned short vendorId;
+    unsigned short productId;
+    octet classCode;
+    octet subclassCode;
+    octet protocolCode;
+};