These were not implicitly added in the Skia build.

Bug: angleproject:4046
Change-Id: I0acdb4056e4598ea372b650dbd8044fe680187b1
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1877483Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>