This initially supports reading two common system fonts. At some point
there should be a more general Open function, but first I need to work
out how to to turn font names into android file names.
Fixesgolang/go#9419.
Change-Id: I8321df873315a5222c39dccf961f742f2e2a7a4c
Reviewed-on: https://go-review.googlesource.com/2059
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
David Crawshaw