Microbench for canvas save/restore calls

Change-Id: I0dbf1af17c3a7ec70437e0479cd8b6b6269d155c
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/433476
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
2 files changed