The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/ffdbf8bd08409744757a05ded0a29a667afc15ce

commit ffdbf8bd08409744757a05ded0a29a667afc15ce
Author: Hitoshi Yoshida <peria@chromium.org>
Date: Fri May 25 06:21:24 2018

IDL compiler: Support [LenientSetter]

This CL supports an extended attribute [LenientSetter]
https://heycam.github.io/webidl/#LenientSetter


Bug:  845883 
Change-Id: I764f91d38c9b89cd6bf7138c6d53bb40d60f7fe2
Reviewed-on: https://chromium-review.googlesource.com/1071150
Reviewed-by: Yuki Shiino <yukishiino@chromium.org>
Reviewed-by: Kenichi Ishibashi <bashi@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Hitoshi Yoshida <peria@chromium.org>
Cr-Commit-Position: refs/heads/master@{#561786}
[modify] https://crrev.com/ffdbf8bd08409744757a05ded0a29a667afc15ce/third_party/blink/renderer/bindings/IDLExtendedAttributes.md
[modify] https://crrev.com/ffdbf8bd08409744757a05ded0a29a667afc15ce/third_party/blink/renderer/bindings/IDLExtendedAttributes.txt
[modify] https://crrev.com/ffdbf8bd08409744757a05ded0a29a667afc15ce/third_party/blink/renderer/bindings/scripts/v8_attributes.py
[modify] https://crrev.com/ffdbf8bd08409744757a05ded0a29a667afc15ce/third_party/blink/renderer/bindings/templates/attributes.cpp.tmpl
[modify] https://crrev.com/ffdbf8bd08409744757a05ded0a29a667afc15ce/third_party/blink/renderer/bindings/templates/interface_base.cpp.tmpl
[rename] https://crrev.com/ffdbf8bd08409744757a05ded0a29a667afc15ce/third_party/blink/renderer/bindings/tests/idls/core/test_attributes.idl
[delete] https://crrev.com/a398ea4fb1d4cb1b78bef5c8f1c663e049235a3e/third_party/blink/renderer/bindings/tests/results/core/v8_test_attribute_getters.cc
[add] https://crrev.com/ffdbf8bd08409744757a05ded0a29a667afc15ce/third_party/blink/renderer/bindings/tests/results/core/v8_test_attributes.cc
[rename] https://crrev.com/ffdbf8bd08409744757a05ded0a29a667afc15ce/third_party/blink/renderer/bindings/tests/results/core/v8_test_attributes.h