This is needed so that other UI fonts don't clip, since
they have been designed assuming that a yMax of at least
2163 is available to them.
The change is achieved by modifying an invisible tiny
square that already existed at the extrema of the the glyph
for U+FFFD REPLACEMENT CHARACTER that was already the
tallest glyph in the fonts.
Bug: 10699356
Change-Id: Ib03ea071b7a82066cacf2b3ae9769db0c449a479
6a0ef07e1f