In the old code, the cache was checked and perged on every reattach
of a strike. That was left out of the multi-threaded code. Add the
check and purge back in to maintain cache size.
* Removed minimum cache size from setCacheSizeLimit.
Bug: skia:10046
Change-Id: I2438c83f04b6da8133c161a29604c3c3d7f58cd8
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/277066
Commit-Queue: Herb Derby <herb@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
