DO NOT MERGE LocaleSpan makes Han disambiguation easy!

Cherry-pick of I7f1b0d49a2ece957a7b9b5d65d48385bf2c2a668 from master.

I've also provided TextView.setTextLocale() for use in single-language
TextViews.

Change-Id: I5692859bfd2aafc284172454d943afc250b22535
4 files changed