• Add support for some more WebGL2 renderbuffer functions 

    Adds support for the following WebGL2 calls:

- `RenderbufferStorageMultisample`
- `GetInternalFormativ`

See: https://www.khronos.org/registry/webgl/specs/latest/2.0/#3.7.5
    @mmatyas @jdm
    mmatyas authored and jdm committed Mar 13, 2020
    5eaa9ef