unflatten directly to font for legacy skps

All of this extra code/parameter-passing for fonts to the paint unflattener
can go away when we can drop support for older skps

Bug: skia:
Change-Id: I4d626f0925a54564b7c386ed80953a0291c8bc1a
Reviewed-on: https://skia-review.googlesource.com/c/183863
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Mike Reed <reed@google.com>
9 files changed