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This helps Dawn create a dawn adapter using the given IDXGIAdapter
instead of loading every single backend and adapter available.

Bug: chromium:1036711
Change-Id: I67ef16b64393aa3521bbf188af7d9f5121480e7f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2296011
Commit-Queue: Natasha Lee <natlee@microsoft.com>
Reviewed-by: Rafael Cintron <rafael.cintron@microsoft.com>
Reviewed-by: Austin Eng <enga@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#832612}