DO NOT MERGE Han Preference

Cherry-pick Ib5dd86950156c5a438f25c289acb839206bb455a from master.

Data: label MTLmr3m with "ja" locale attribute, fallback_fonts-ja.xml removed,
as we only need a single fallback font file
Code: Add locale and variant to TextLayoutCache.  Paint.java sets textLocale as
the language (for example, "ja") rather than the language/locale concatenated
(for example "ja_JP")

This checkin, along with Change-Id: Id8c91ae0be6cad8a7ef77a0cd5803676290986c1,
allows text view objects to set their locale dynamically and skia will use the
correct font for the locale.

Change-Id: Ieb60b0d7a39fcfef4f8ce90cd4f6065d33673710