Emit trace enter/exit ops in SkRP.

Change-Id: I347da70f6507e4f7bea4fc4ad7859ed8911aeffe
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/662216
Commit-Queue: Brian Osman <brianosman@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
8 files changed