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Updating with to new OTS repo from https://github.com/khaledhosny/ots.git
Hash tag imported: c24a839b1c66c4de09e58fabaacb82bf3bd692a4

Some important differences between new and old version of OTS:
1. Support for MATH table
2. Implementation changes related to new WOFF 2.0
3. Bug fixes related to OTF tables (GDEF, GSUB etc) parsing
4. Accept platform 0 encoding 1 cmap subtables
5. Allow fonts with CMAP format-12 or format-13 table

A dummy version of EnableWOFF() is added to get Blink compiled.
After the following CL is landed in Blink, it'll be removed.
Blink CL: https://codereview.chromium.org/774253008

TEST: Blink layout tests: fast/css/font-face*
BUG=339857

Committed: https://crrev.com/3b6cd2d4bf9e0b4a9311343a2997ef9363530b14
Cr-Commit-Position: refs/heads/master@{#308054}

Review URL: https://codereview.chromium.org/775893002

Cr-Commit-Position: refs/heads/master@{#317189}