Add test for ascent and descent of serif and mono fonts

fontchain_lint now has tests making sure that their ascent and
descent matches that of Roboto.

Also, this moves a test class that contains a similar test and and
other related tests from graphictests to coretests.

Bug: 19791102
Change-Id: I8b473dd2a5f97ae2e3d322a2cabc16f3d32489f6