SkQP: mark readpixels as a bad GM

Bug: b/140327954
Change-Id: Id661bd605fad94a7cbb40d3cdb9a581db11929d5
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/245677
Reviewed-by: Derek Sollenberger <djsollen@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
diff --git a/platform_tools/android/apps/skqp/src/main/assets/skqp/rendertests.txt b/platform_tools/android/apps/skqp/src/main/assets/skqp/rendertests.txt
index de1937a..4d5e488 100644
--- a/platform_tools/android/apps/skqp/src/main/assets/skqp/rendertests.txt
+++ b/platform_tools/android/apps/skqp/src/main/assets/skqp/rendertests.txt
@@ -533,7 +533,6 @@
 radial_gradient4,-1
 radial_gradient4_nodither,-1
 radial_gradient_precision,-1
-readpixels,0
 readpixelscodec,0
 readpixelspicture,0
 recordopts,0