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The following CL set up a pipeline to send a map of the system colors
from the browser process to the render process:
https://chromium-review.googlesource.com/c/chromium/src/+/1728056

This change takes those system colors and uses them in
LayoutThemeWin::SystemColor(). This replaces the old logic of making
API calls to get the system colors.

LayoutThemeWin accesses the system colors stored in NativeTheme
through WebThemeEngineDefault.

Unit tests were added for conversions between Blink and NativeTheme
types. This required pulling the static conversion methods into
their own header.

Bug: 970285
Change-Id: I842e5224aa3a97852eda13c3d86f90396262fde9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1793742
Commit-Queue: Kurt Catti-Schmidt <kschmi@microsoft.com>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Philip Rogers <pdr@chromium.org>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Kevin Babbitt <kbabbitt@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#699050}