GitLab

In WebIDL spec, [Unforgeable] can appear on interface attributes
and interface non-static operations.
https://heycam.github.io/webidl/#Unforgeable

Now our IDL compiler does not check its use cases.
This CL makes IDL compiler to check if [Unforgeable] appears on
interfaces or static members, and stops with a warning message
if it does.


Bug: 674593
Change-Id: I6f17834eae71b3c7aa44556c3442f679091efd59
Reviewed-on: https://chromium-review.googlesource.com/1198711Reviewed-by: Kenichi Ishibashi <bashi@chromium.org>
Reviewed-by: Yuki Shiino <yukishiino@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Hitoshi Yoshida <peria@chromium.org>
Cr-Commit-Position: refs/heads/master@{#587973}