Make ARGB fallback use common strike lookup

This is a larger CL. It makes fallback ARGB glyphs use
the same strike lookup, and it introduces the two cases
for fallback -- source and device. Source assumes that the
strike data will be transformed while rendering. Device
assumes that the data in the strike is already in device
space.

Change-Id: I5857bc17c6aaec21d48de9ac9102adafff9688fe
Reviewed-on: https://skia-review.googlesource.com/c/192120
Commit-Queue: Herb Derby <herb@google.com>
Reviewed-by: Ben Wagner <bungeman@google.com>
4 files changed