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This patch adds the woff2 library [1] which is used to decode WOFF 2.0
web font file format. It's going to replace the old version of WOFF 2.0
decoder included in third_party/ots.

[1] https://github.com/google/woff2 (revision 445f5419)

BUG=434596
TEST=trybots

Review URL: https://codereview.chromium.org/954163002

Cr-Commit-Position: refs/heads/master@{#322517}