Count getComputedStyle() for -webkit-appearance

Now getComputedStyle() for -webkit-appearance returns adjusted values.
See [1].  We'd like to know whether we can remove this behavior or not.

[1] https://github.com/whatwg/compat/issues/6#issuecomment-181715665

Bug: 810162
Change-Id: Icc17d681d7105d8a77ff07e18b7f270bd6918f01
Reviewed-on: https://chromium-review.googlesource.com/936523
Reviewed-by: Takayoshi Kochi <kochi@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/master@{#539142}
3 files changed