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This includes performance fixes for hb_set. After this lands, we need to
inspect the graphs for issue 782220 and 781794 to see if performance
regressions return. Previously, these performance regressions were fixed
by reverting to the old hb_set implementation, compare
https://chromium-review.googlesource.com/c/chromium/src/+/804374.

1.7.2 also includes an additional API that allows setting the CTFont
directly, and should help with issue 785522.

Bug: 791915
Change-Id: I447c1527d81e01c01253d0c3fa5b8c8b3a5a3683
Tbr: behdad, eae, kojii
Reviewed-on: https://chromium-review.googlesource.com/807986
Commit-Queue: Dominik Röttsches <drott@chromium.org>
Reviewed-by: Koji Ishii <kojii@chromium.org>
Reviewed-by: Dominik Röttsches <drott@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521689}