Add support for \kern

Summary:
This only supports em and ex units and doesn't handle vertical layouts.
Negative kerning works.

Test Plan:
- make test
- make screenshots (verify that d is slightly overlapping c in the screenshots)

Reviewers: emily
This commit is contained in:
Kevin Barabash
2015-12-30 16:58:50 -08:00
parent c79fb58936
commit 3083efba66
7 changed files with 62 additions and 0 deletions

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