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Builds the bindings of IDL enumeration generated with the new
bindings generator in prod, despite that the bindings is not
yet used.  This patch makes it available for real use.

Bug: 839389
Change-Id: Id5cafd53ab043f75c5244f8fb6a0e134c5ce861d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2022124
Commit-Queue: Yuki Shiino <yukishiino@chromium.org>
Reviewed-by: Hitoshi Yoshida <peria@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#736356}