I will try to check this issue.

Thanks! Just so we don't clash, I'm adding layout tests for CSSScale and CSSRotation as part of  crbug.com/774887 . The patches should land soon.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/730c6336eb93bf5d1dd94c6f97c2b8433b348ede

commit 730c6336eb93bf5d1dd94c6f97c2b8433b348ede
Author: nikhil <nikhil.sahni@samsung.com>
Date: Fri Dec 01 06:32:53 2017

[css-typed-om] CSSRotation should take Numberishes.

CSSRotation currently only takes CSSNumericValues.
It should also be able to take raw doubles (Numberishes).

Spec: https://drafts.css-houdini.org/css-typed-om-1/#cssrotation

Bug:  784217 
Change-Id: Ic4736ff2ca2d54023d38c8eceb0a44fd3a68b557
Reviewed-on: https://chromium-review.googlesource.com/768583
Commit-Queue: NIKHIL SAHNI <nikhil.sahni@samsung.com>
Reviewed-by: Darren Shen <shend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#520876}
[modify] https://crrev.com/730c6336eb93bf5d1dd94c6f97c2b8433b348ede/third_party/WebKit/LayoutTests/typedcssom/stylevalue-subclasses/cssRotation-expected.txt
[modify] https://crrev.com/730c6336eb93bf5d1dd94c6f97c2b8433b348ede/third_party/WebKit/LayoutTests/typedcssom/stylevalue-subclasses/cssRotation.html
[modify] https://crrev.com/730c6336eb93bf5d1dd94c6f97c2b8433b348ede/third_party/WebKit/Source/core/css/cssom/CSSRotation.cpp
[modify] https://crrev.com/730c6336eb93bf5d1dd94c6f97c2b8433b348ede/third_party/WebKit/Source/core/css/cssom/CSSRotation.h
[modify] https://crrev.com/730c6336eb93bf5d1dd94c6f97c2b8433b348ede/third_party/WebKit/Source/core/css/cssom/CSSRotation.idl

Can we close this now?