When validating image size, use format for SubImage calls. internalFormat is GL_NONE when validating these calls for glTexSubImage and leads to an expected minimum size of 0. Add extra unsized formats that are never supported to the format tables. These are needed for determining the size of input data. BUG=angleproject:2054 Change-Id: Ic827a279a246ff92c9f279232574521692b1c6f2 Reviewed-on: https://chromium-review.googlesource.com/526356 Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Corentin Wallez <cwallez@chromium.org> Commit-Queue: Geoff Lang <geofflang@chromium.org>