Begin support for large color emoji glyphs

Bug: skia:
Change-Id: I10184a0c2ffae9baf3adb3c670d5e61ceeaf90ff
Reviewed-on: https://skia-review.googlesource.com/93360
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Jim Van Verth <jvanverth@google.com>
6 files changed