Add a Windows INF file for the non-standard USB gadget devices.

Add a Windows INF file for the non-standard USB gadget devices.

This file instructs Windows to load the WinUSB driver for the default
test gadget configuration and the USB echo gadget configuration. As
this INF file is not part of a signed driver package it must be
manually loaded against the device.

Windows 8 will also load WinUSB if it finds the appropriate compatible
ID descriptor on the device. A later patch will add this descriptor
in order to bypass the manual installation step required on previous
versions of Windows.

BUG=

Committed: https://crrev.com/f4349dedab476fbb09e17ac398bd37b572a440d9
Cr-Commit-Position: refs/heads/master@{#308365}

[Reilly Grant (use Gerrit), 2014-12-13 00:49:00]

reillyg@chromium.org changed reviewers:
+ rpaquay@chromium.org

[Reilly Grant (use Gerrit), 2014-12-13 00:49:43]

Renaud, please take a look at you're the most likely person to know what to do
with the first INF file added to the Chromium repository.

[rpaquay, 2014-12-15 17:12:16]

lgtm

[Reilly Grant (use Gerrit), 2014-12-15 17:14:45]

The CQ bit was checked by reillyg@chromium.org

[commit-bot: I haz the power, 2014-12-15 17:15:45]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/803723002/1

[commit-bot: I haz the power, 2014-12-15 17:24:22]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-12-15 17:25:01]

Patchset 1 (id:??) landed as
https://crrev.com/f4349dedab476fbb09e17ac398bd37b572a440d9
Cr-Commit-Position: refs/heads/master@{#308365}