This was blocking using our GN files in Skia.

Bug: angleproject:4046
Change-Id: I12887a53c5f92b0e00206f8d391a8d03433b5e6e
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1877475Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>