Fix validation of querying GL_FRAGMENT_SHADER_DERIVATIVE_HINT. This enum is queryable in ES3 or with the GL_OES_standard_derivatives extension. BUG=2110 Change-Id: I688777bcc65468d796333a24223d24cc66170788 Reviewed-on: https://chromium-review.googlesource.com/576156 Reviewed-by: Corentin Wallez <cwallez@chromium.org> Commit-Queue: Geoff Lang <geofflang@chromium.org>