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The availability of IDWriteFontFactory2 (which has the
TranslateColorGlyphRun method on it) is equivalent to the ability of the
underlying DirectWrite implementation to render COLR/CPAL fonts. We are
using this detection to find out whether we are running on a system that
can render COLR/CPAL natively, otherwise pass the web font to a
COLR/CPAL SkFontMgr based on FreeType.

Tests updated to reliably test rendering results for COLR/CPAL including
our Windows 7 bots.

Mac detection to do the same fallback for OS versions below Mac OS 10.13
will follow in a subsequent CL.

Bug: 882844
Cq-Include-Trybots: luci.chromium.try:linux_layout_tests_layout_ng;luci.chromium.try:linux_layout_tests_slimming_paint_v2;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I5f5aa16cbb176d22d229dee05619419cbb8bb892
Reviewed-on: https://chromium-review.googlesource.com/1219887
Commit-Queue: Dominik Röttsches <drott@chromium.org>
Reviewed-by: Emil A Eklund <eae@chromium.org>
Cr-Commit-Position: refs/heads/master@{#592743}