This is a reland of 4004ae0e

Fix: Put the missing early-out in ValidatePointParameterCommon

Original change's description:
> GLES1: Point rasterization (partial implementation)
>
> - Not included: Smooth points
>
> - GL_OES_point_sprite
> - Update test expectations. Note: due to different random sampling,
> edge cases were hit in UserClip. Disabling that test for now.
>
> BUG=angleproject:2306
>
> Change-Id: If8367bc3321804b3299d3bc381d6a8e236754baa
> Reviewed-on: https://chromium-review.googlesource.com/1101910
> Reviewed-by: Corentin Wallez <cwallez@chromium.org>
> Commit-Queue: Lingfeng Yang <lfy@google.com>

Bug: angleproject:2306
Change-Id: Id8e71352a77ff0ce71cb604965effbfb8aca613e
Reviewed-on: https://chromium-review.googlesource.com/1108458Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Lingfeng Yang <lfy@google.com>