R and B channels are swapped in cube map on https://webgpu.github.io/webgpu-samples/samples/cubemap
<rdar://problem/108264195>
Pull request: https://github.com/WebKit/WebKit/pull/12921
Committed 263153@main (0259a9cfdd2a): <https://commits.webkit.org/263153@main> Reviewed commits have been landed. Closing PR #12921 and removing active labels.