Update matrix-setup code in stroke tessellator.

As of http://review.skia.org/449518 we no longer allow matrix
constructors containing vectors that spill across multiple columns; it
doesn't reliably work on all GPUs. The tessellator needed a small fixup
to support this new limitation.

Change-Id: I82853b6c8ae83597aab3eab611dd10072d23eca5
Bug: skia:12443
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/449836
Auto-Submit: John Stiles <johnstiles@google.com>
Commit-Queue: Leon Scroggins <scroggo@google.com>
Reviewed-by: Leon Scroggins <scroggo@google.com>
1 file changed