Add test for processor->resource ref/io counts

Change-Id: I63a8cb9f1564bfc15ef98121b77946a647c79f32
Reviewed-on: https://skia-review.googlesource.com/6814
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
6 files changed