remove drawing from ShaderMaskBench ctor

The drawing in the ctor makes debugging and measuring the
RasterPipeline difficult. Move to onDelayedSetup().

Change-Id: I74ca28d5d86d70d23e67188f1363b002ba85c6ef
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/452358
Commit-Queue: Herb Derby <herb@google.com>
Auto-Submit: Herb Derby <herb@google.com>
Reviewed-by: John Stiles <johnstiles@google.com>
1 file changed