bindings: Limit IDLOptional use case only in arguments
We design IDL dictionary members separated from IDLOptional, and hence we use IDLOptional only in arguments. This CL makes a utility function native_value_tag to output IDLOptional iff its target is an argument. Bug: 839389 Change-Id: I3b95e870b38ed4e1917408cac0a923a17db88307 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2589233Reviewed-by:Yuki Shiino <yukishiino@chromium.org> Commit-Queue: Hitoshi Yoshida <peria@chromium.org> Cr-Commit-Position: refs/heads/master@{#837048}
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