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>