[graphite] Add caching functionality to ClipAtlasManager

Bug: b/388809647
Bug: b/388808216
Change-Id: I9908a0059d4f39cfc2707049afb640d92a95fca9
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/937417
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
Commit-Queue: Jim Van Verth <jvanverth@google.com>
6 files changed