Fix sans-serif-thin and sans-serif-light fonts in layoutlib. [DO NOT MERGE]

For these font families, text was always rendered as italic. This
changeset fixes the issue.

Bug: http://b.android.com/57221
Change-Id: Ic8a299bd1e555f5bb914cd3d2fe72917ec7f471a
(cherry-picked from 5be65fda15c6f66067da3cc623811427e9d541e4)
1 file changed