Allow vulkan to upload data to testing textures with optimal layouts

gm/imagefromyuvtextures.cpp

Index: gm/imagefromyuvtextures.cpp
diff --git a/gm/imagefromyuvtextures.cpp b/gm/imagefromyuvtextures.cpp
index 3d25a0b3ba0c7d1836cf127191f33c39f995859a..e523d2298837854693741f9ffd50d7fee1d7ce96 100644
--- a/gm/imagefromyuvtextures.cpp
+++ b/gm/imagefromyuvtextures.cpp
@@ -31,7 +31,7 @@ protected:
     }
 
     SkISize onISize() override {
-        return SkISize::Make(50, 135);
+        return SkISize::Make(50, 175);
     }
 
     void onOnceBeforeDraw() override {