Add a missing #include. Bug: angleproject:8580 Change-Id: I9dadaf9afa6d3335b2a621aece19bcd315be319a Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/5344351 Commit-Queue: Geoff Lang <geofflang@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org>