[WebGPU] CompositorIntegrationImpl should store WebCore::IOSurface instances not IOSurfaceRef directly This is needed to get WebGPU working in a web worker with offscreen canvas.
<rdar://problem/116253806>
Pull request: https://github.com/WebKit/WebKit/pull/18440
Committed 268691@main (912e5b85f7e3): <https://commits.webkit.org/268691@main> Reviewed commits have been landed. Closing PR #18440 and removing active labels.