Add benchmark for SkRP compiler backend.

This will let us gauge its performance.

Change-Id: I459d903b01a15c04a085c0e74beb440923fcde7c
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/671056
Auto-Submit: John Stiles <johnstiles@google.com>
Commit-Queue: Kevin Lubick <kjlubick@google.com>
Reviewed-by: Kevin Lubick <kjlubick@google.com>
2 files changed