The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/889ebb251addf7c0ffc6ebc8530170a59c91be64

commit 889ebb251addf7c0ffc6ebc8530170a59c91be64
Author: Hwanseung Lee <hs1217.lee@samsung.com>
Date: Tue Dec 12 02:44:11 2017

[css-typed-om] Sort properties which is from iterator

Sort properties which is from iterator of StylePropertyMapReadOnly
According to spec,
* normal properties are sorted alphabetically.
* custom properties are sorted by increasing code point order.
* custom properties are sorted after normal properties.

present, normal properties has always lower case.
so to sort alphabetical is same effect with sorting code point

https://drafts.css-houdini.org/css-typed-om-1/#dom-stylepropertymap-getproperties

Bug:  779841 
Change-Id: I7532cf2e322073705db2c124fa12116fc38f2345
Reviewed-on: https://chromium-review.googlesource.com/808746
Reviewed-by: Darren Shen <shend@chromium.org>
Commit-Queue: Hwanseung Lee <hs1217.lee@samsung.com>
Cr-Commit-Position: refs/heads/master@{#523312}
[modify] https://crrev.com/889ebb251addf7c0ffc6ebc8530170a59c91be64/third_party/WebKit/LayoutTests/typedcssom/inlinestyle/inlineStylePropertyMap_iterationWithModification.html
[modify] https://crrev.com/889ebb251addf7c0ffc6ebc8530170a59c91be64/third_party/WebKit/LayoutTests/typedcssom/the-stylepropertymap/iterable-expected.txt
[modify] https://crrev.com/889ebb251addf7c0ffc6ebc8530170a59c91be64/third_party/WebKit/Source/core/css/cssom/InlineStylePropertyMap.cpp