The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/d1d4800117bc90245289802cbc50e4f8501bcb6a

commit d1d4800117bc90245289802cbc50e4f8501bcb6a
Author: Anders Hartvoll Ruud <andruud@chromium.org>
Date: Sat Jun 09 00:24:45 2018

Include non-inherited variables when iterating computedStyleMap.

R=futhark@chromium.org

Bug:  850018 
Change-Id: Ia9a4ddb849032f321f548146ab6b4f47fa42ac28
Reviewed-on: https://chromium-review.googlesource.com/1090919
Commit-Queue: Anders Ruud <andruud@chromium.org>
Reviewed-by: Rune Lillesveen <futhark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565794}
[modify] https://crrev.com/d1d4800117bc90245289802cbc50e4f8501bcb6a/third_party/WebKit/LayoutTests/typedcssom/computedstyle/custom-properties-expected.txt
[modify] https://crrev.com/d1d4800117bc90245289802cbc50e4f8501bcb6a/third_party/WebKit/LayoutTests/typedcssom/computedstyle/custom-properties.html
[modify] https://crrev.com/d1d4800117bc90245289802cbc50e4f8501bcb6a/third_party/blink/renderer/core/css/computed_style_css_value_mapping.cc
[modify] https://crrev.com/d1d4800117bc90245289802cbc50e4f8501bcb6a/third_party/blink/renderer/core/style/style_non_inherited_variables.cc
[modify] https://crrev.com/d1d4800117bc90245289802cbc50e4f8501bcb6a/third_party/blink/renderer/core/style/style_non_inherited_variables.h