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Contains required changes to fix trak table to support on Mac (issue
627609), and Unicode 10 updates, an ICU build fix and fixes for
hb_set.

Bug: 774502
Change-Id: Ie8e39a42d197c26f26f6478bd8ef64c13c5a4757
Reviewed-on: https://chromium-review.googlesource.com/718752
Commit-Queue: Dominik Röttsches <drott@chromium.org>
Reviewed-by: Ben Wagner <bungeman@chromium.org>
Reviewed-by: Emil A Eklund <eae@chromium.org>
Cr-Commit-Position: refs/heads/master@{#513541}