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Shaping code relies on feature detection to determine whether the font
has small-caps support or not. If not, small capitals are synthesized
from uppercased letters with scaled-down font size. Add feature
detection for AAT fonts on Mac. Now the shaping code can enable the
built-in small-caps glyphs for a set of system font that have them.

Tests: open_type_caps_support_test.cc unit test for feature
detection, fast/text/small-caps-aat.html layout test.

Bug: 900955
Change-Id: I9bb31719b0a1b5e81a428030cfdeaf91b8e6d17e
Reviewed-on: https://chromium-review.googlesource.com/c/1353927
Commit-Queue: Dominik Röttsches <drott@chromium.org>
Reviewed-by: Emil A Eklund <eae@chromium.org>
Reviewed-by: Behdad Esfahbod <behdad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612171}