Fix gm slide 'TessellationTestRectShader'.
Fix gm slide 'TessellationTestRectShader'.

This needed to be updated to match changes in
http://review.skia.org/382476. It is not tested on any of the normal
CQ trybots.

Change-Id: I3c0843d8e77958192c0db9ad8f6b797aec887fe4
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/382757
Auto-Submit: John Stiles <f4fcf42d3bb5924557f1eeb3be66747535e585da@google.com>
Reviewed-by: Chris Dalton <ef7fc3a08ada7d31f16e9a18b5f3c728256e041e@google.com>
Commit-Queue: John Stiles <f4fcf42d3bb5924557f1eeb3be66747535e585da@google.com>

google/skia,google/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia,aosp-mirror/platform_external_skia,google/skia,google/skia,google/skia,google/skia,aosp-mirror/platform_external_skia,google/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia,google/skia,aosp-mirror/platform_external_skia