This is a reland of 4a09c1a2

Entry points have been autogenerated again.

Original change's description:
> GLES1: Entry points for lighting and materials
>
> - glLight*/glMaterial and their queries
> - Use new packed enums in these entry points, except for lightmodel
> which stays GLenum to be consistent with other generic glGet's
> - State.cpp: New glGet* queries related to light model and
> light/normal rescale enablement
> - GLES1State.cpp: Functions to get/set lighting/material state
> - Validation for lighting/materials
>
> + Add a few convenience methods to random_utils for sampling
> non-negative floats and a sampler for random booleans
>
> BUG=angleproject:2306
>
> Change-Id: If7ba0c0a0dc75f88fbaa986b904f1ea96ee6512e
> Reviewed-on: https://chromium-review.googlesource.com/1065502
> Commit-Queue: Lingfeng Yang <lfy@google.com>
> Reviewed-by: Geoff Lang <geofflang@chromium.org>

Bug: angleproject:2306
Change-Id: I434273acd5200dd9f4925e239a032cc8db31a434
Reviewed-on: https://chromium-review.googlesource.com/1072849Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Lingfeng Yang <lfy@google.com>