ccpr: Recycle cache entries when possible to avoid malloc

Bug: skia:
Change-Id: Id06098f66ad6399c11707f8380597e7eeb392eec
Reviewed-on: https://skia-review.googlesource.com/138441
Commit-Queue: Chris Dalton <csmartdalton@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
2 files changed