The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/9b7705c2d31d7536d7fee713c24fd598a62b63c7

commit 9b7705c2d31d7536d7fee713c24fd598a62b63c7
Author: timloh <timloh@chromium.org>
Date: Thu Jan 12 10:52:17 2017

Fix setting css-wide keywords on registered custom properties

This patch fixes setting of css-wide keywords on registered custom
properties, which was broken by crrev.com/2607403002.

BUG= 679627 

Review-Url: https://codereview.chromium.org/2624213004
Cr-Commit-Position: refs/heads/master@{#443204}

[modify] https://crrev.com/9b7705c2d31d7536d7fee713c24fd598a62b63c7/third_party/WebKit/LayoutTests/custom-properties/registered-property-cssom.html
[modify] https://crrev.com/9b7705c2d31d7536d7fee713c24fd598a62b63c7/third_party/WebKit/Source/core/css/parser/CSSParserImpl.cpp