The fonts are passed through Noto's identity subsetter, which keeps the same
functionality, but compresses tables.  Most importantly, the post table is
converted to version 3.0, which saves a lot of space by removing glyph
names.

The build footprint of the non-extended font profile is reduced by 140KB.

Bug: 15348046
Change-Id: I6df611394fd7c3a698c6eb5677422457d1776992