Unlike fuchsia_x64, this trybot builds with angle_top_of_tree, and won't
cause random patch failures.

Bug: angleproject:3146

Change-Id: Iea8f93c7e3b6c4bf4514a9c0c6eacca9bd3228c8
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1611730
Commit-Queue: Michael Spang <spang@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>