WebGPU: Add a feature to avoid wgpuInstanceWaitAny Synchronous waiting is not available in Chrome's renderer process yet. Add a temporary feature to avoid some WaitAny calls and just log errors instead. Bug: angleproject:413078308 Change-Id: I67e54dfcfc093fd250da8cc616c05d44b78c8d64 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6593531 Reviewed-by: Corentin Wallez <cwallez@chromium.org> Commit-Queue: Geoff Lang <geofflang@chromium.org>