Add support for stepping out from a function.

Stepping out is extremely similar to stepping-over, so this was mostly
working already.

Change-Id: Ib1c1ba96b45a732500e72b6da4cbfe41a1f75307
Bug: skia:12666
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/483196
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
4 files changed