Test texture domain effect with local matrix.

Add a common way to make rect op for testing that uses a GP with a local
matrix.

Change-Id: I958d1230bd5067b2e4b60fcd374e2f7718681e43
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/255782
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
diff --git a/BUILD.gn b/BUILD.gn
index e9ad6f4..66f7849 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -1321,6 +1321,8 @@
       "tools/gpu/MemoryCache.h",
       "tools/gpu/ProxyUtils.cpp",
       "tools/gpu/TestContext.cpp",
+      "tools/gpu/TestOps.cpp",
+      "tools/gpu/TestOps.h",
       "tools/gpu/YUVUtils.cpp",
       "tools/gpu/YUVUtils.h",
       "tools/gpu/mock/MockTestContext.cpp",