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These were not marked as optional previously because it would mean that C++ methods would look like void F(a = null, b, c) which is invalid in C++ because default arguments must be contiguous and at the end of the signature. This commit adds a special case when optional=true where no_default=true still marks the argument as optional, but doesn't produce a C++ default argument. Fixed: dawn:1502 Change-Id: I1b648d37edb94b8412109fc0a06a91bbbd31b8c4 Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/97002 Kokoro: Kokoro <noreply+kokoro@google.com> Commit-Queue: Corentin Wallez <cwallez@chromium.org> Reviewed-by: Austin Eng <enga@chromium.org>