On D3D11 Feature Level 9, use IDXGIAdapter2::GetDesc2.

On Feature Level 9_3, GetDesc() returns "Software Adapter" in the hardware
description string, instead of a description of the actual GPU. As a
result, glGetString(GL_RENDERER) on 9_3 wouldn't return any useful info
about the current hardware.

Change-Id: Ie4d329a08a03ee044fc0b594308aaf0bf235c74e
Reviewed-on: https://chromium-review.googlesource.com/233663
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Tested-by: Austin Kinross <aukinros@microsoft.com>