[graphite] Only track command buffer work in debug builds

Bug: skia:12466
Change-Id: Id17222170984731eb36b8158c5c97b9880d3a814
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/478496
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Jim Van Verth <jvanverth@google.com>
3 files changed