Move all uniform validation from ProgramBinary to API layer. This will have the contract of having a successful API call once we call into the ANGLE internals, having successfully passed valiation. BUG=angle:571 Change-Id: Ia8d6eccc1e42bdf9e9cc5c10094a08729b42778a Reviewed-on: https://chromium-review.googlesource.com/200075 Reviewed-by: Geoff Lang <geofflang@chromium.org> Reviewed-by: Shannon Woods <shannonwoods@chromium.org> Tested-by: Jamie Madill <jmadill@chromium.org>