This makes it run correctly on Linux where the only platform available is OpenGL. BUG=angleproject:892 Change-Id: I3d72163b49b35daba702ebb5b48d010761c7fb6d Reviewed-on: https://chromium-review.googlesource.com/270262Reviewed-by: Geoff Lang <geofflang@chromium.org> Tested-by: Corentin Wallez <cwallez@chromium.org>
