Factor out common digest code for RemoteStrike

Change-Id: I9a27b52bb0d3f96d296d712fe36a727f8ad5ded4
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/552683
Reviewed-by: Jim Van Verth <jvanverth@google.com>
Commit-Queue: Herb Derby <herb@google.com>
1 file changed