GitLab

Implements NativeValueTraits<IDLNullable<old dict>> and
bindings::VariadicArgumentsToNativeValues.

Bug: 839389
Change-Id: Ifc5712b885bd8dd0841f61eb95e4f942db132372
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2068264
Commit-Queue: Yuki Shiino <yukishiino@chromium.org>
Reviewed-by: Hitoshi Yoshida <peria@chromium.org>
Cr-Commit-Position: refs/heads/master@{#744216}