Smaller fragment from "Reduce dependence on GrSurface's origin field"

TBR=bsalomon@google.com
Change-Id: I996226ffaf84ca357740a6da9bb80a3b8febb379
Reviewed-on: https://skia-review.googlesource.com/25745
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
diff --git a/src/gpu/effects/GrConfigConversionEffect.cpp b/src/gpu/effects/GrConfigConversionEffect.cpp
index e4989de..e8d0477 100644
--- a/src/gpu/effects/GrConfigConversionEffect.cpp
+++ b/src/gpu/effects/GrConfigConversionEffect.cpp
@@ -133,6 +133,7 @@
         return false;
     }
     GrSurfaceDesc desc;
+    desc.fOrigin = kTopLeft_GrSurfaceOrigin;
     desc.fWidth = kSize;
     desc.fHeight = kSize;
     desc.fConfig = kConfig;