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This is a reland of c1f6f104

The build failure of release branches (canary, etc.) should be
fixed with https://crrev.com/c/2029405 .  This is a reland of
the original patch with no change.

Original change's description:
> bind-gen: Build generated IDL enumeration in prod
>
> 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}

Bug: 839389
Change-Id: I577dc9e7f2a488585f0c10785fd8fb216df33ea0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2030351Reviewed-by: Hitoshi Yoshida <peria@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Yuki Shiino <yukishiino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737679}