Add bigrect GM.

Previous version in https://codereview.chromium.org/1758113005
was reverted.

Bug: skia:4632
Change-Id: I9a85f11ca3a6fcd5e67016edf67f0538f00b6f01
Reviewed-on: https://skia-review.googlesource.com/14751
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Ben Wagner <benjaminwagner@google.com>
2 files changed