Add SampleLocationsTestOp::onPrePrepare

Bug: skia:9455
Change-Id: I2fb9bbba7c2315e300f363b34168f59eafdda8ce
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/255084
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
1 file changed