Move strike cache Find*() to strike cache

BUG=skia:7515

Change-Id: Ic1580d4752d51a62df5427a28f843bc7b3181797
Reviewed-on: https://skia-review.googlesource.com/122020
Commit-Queue: Herb Derby <herb@google.com>
Reviewed-by: Mike Klein <mtklein@chromium.org>
17 files changed