GitLab

https://heycam.github.io/webidl/#construct-a-callback-function
This patch supports "construct" algorithm of IDL callback functions.

The following WIP patch will be going to use this algorithm.
https://chromium-review.googlesource.com/c/chromium/src/+/1170731

Bug: 873942
Change-Id: I3d58db6cb4cb23662593e2c96080668346a399a2
Reviewed-on: https://chromium-review.googlesource.com/1174079Reviewed-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@{#583192}