Add back shared DawnUtilsPriv without using it.

This is essenetially a reland of half the original change. This adds the
gni information so we can land a change in Chrome to build the new stuff
before we start using it.

Change-Id: Id6f10e88a776bb7373cbbe1d338dc264881ef931
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/655817
Reviewed-by: Jim Van Verth <jvanverth@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
7 files changed