Isolate cache lookups in preparation to hoist into painter

This essentially reverts the CL
https://skia-review.googlesource.com/c/skia/+/180375

at this point combining the strike and glyph cache seems like
the wrong direction.

Change-Id: I66a673469fd12869263a3826d6ec6be622b2b9a1
Reviewed-on: https://skia-review.googlesource.com/c/180777
Reviewed-by: Herb Derby <herb@google.com>
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
Commit-Queue: Herb Derby <herb@google.com>
3 files changed