The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/4dd6370b294f7b93dc6b03040602cfb2117ffaac

commit 4dd6370b294f7b93dc6b03040602cfb2117ffaac
Author: Chris Nardi <cnardi@chromium.org>
Date: Wed Mar 07 06:26:43 2018

[cssom] Update CSSKeyframeRule IDL

https://drafts.csswg.org/css-animations/#interface-csskeyframerule-idl
shows [SameObject, PutForwards=cssText] as attributes on style. Update
our IDL file to match the spec.

Bug:  818860 
Change-Id: I43c199f8c0587b0736cd3f8944b5e5c36b908d33
Reviewed-on: https://chromium-review.googlesource.com/949973
Reviewed-by: Philip Jägenstedt <foolip@chromium.org>
Commit-Queue: Philip Jägenstedt <foolip@chromium.org>
Cr-Commit-Position: refs/heads/master@{#541368}
[delete] https://crrev.com/6ae855011dd2d12c81fead263044931b342da12a/third_party/WebKit/LayoutTests/external/wpt/css/cssom/CSSKeyframeRule-expected.txt
[modify] https://crrev.com/4dd6370b294f7b93dc6b03040602cfb2117ffaac/third_party/WebKit/LayoutTests/virtual/stable/webexposed/global-interface-listing-expected.txt
[modify] https://crrev.com/4dd6370b294f7b93dc6b03040602cfb2117ffaac/third_party/WebKit/LayoutTests/webexposed/global-interface-listing-expected.txt
[modify] https://crrev.com/4dd6370b294f7b93dc6b03040602cfb2117ffaac/third_party/WebKit/Source/core/css/CSSKeyframeRule.idl