WebGLRenderingContextBase::readPixels should allow null pixels on the IDL level (including the .idl file) and emit INVALID_VALUE with an appropriate message instead of failing with JS TypeError. Tested in https://github.com/KhronosGroup/WebGL/pull/3486
<rdar://problem/99078383>
Pull request: https://github.com/WebKit/WebKit/pull/3605
Committed 255256@main (e5af469c39da): <https://commits.webkit.org/255256@main> Reviewed commits have been landed. Closing PR #3605 and removing active labels.