[WebGPU] GPURenderBundleEncoder.drawIndirect and GPURenderBundleEncoder.drawIndexedIndirect have synchronization issues because we attempt to directly read .contents on the indirect buffer, but it might not be ready yet.
<rdar://problem/117948947>
Pull request: https://github.com/WebKit/WebKit/pull/20005
Committed 270311@main (f915246e31c3): <https://commits.webkit.org/270311@main> Reviewed commits have been landed. Closing PR #20005 and removing active labels.