• Add support for WebGL2 TexStorage2D 

    Adds initial support for the WebGL2 `TexStorage2D` call, adds
support for the related texture enums and enables some of the
texture tests.

See: https://www.khronos.org/registry/webgl/specs/latest/2.0/#3.7.6
    @mmatyas @jdm
    mmatyas authored and jdm committed Apr 30, 2020
    8789a6a