Add a work indication to SkDeferredDisplayList::ProgramIterator::compile

Chrome hopes to use this as a heuristic for when to yield. I.e., if no work is done, keep going but yield after each compile that did work.

Change-Id: I9524ca03078af3cd60f0042b2e8b0ec4c628e5f2
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/288176
Reviewed-by: Greg Daniel <egdaniel@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
5 files changed