Add usesMSAASurface to GrMeshDrawOp::Target

Also switches GrFillRRectOp to call usesMSAASurface.

Bug: skia:11396
Change-Id: I66d0ee2c6dc76819efc0f3283f6e1a0af11f23f7
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/395136
Commit-Queue: Chris Dalton <csmartdalton@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
diff --git a/src/gpu/mock/GrMockOpTarget.h b/src/gpu/mock/GrMockOpTarget.h
index e3cb2f1..983b29d 100644
--- a/src/gpu/mock/GrMockOpTarget.h
+++ b/src/gpu/mock/GrMockOpTarget.h
@@ -105,6 +105,7 @@
     UNIMPL(GrRenderTargetProxy* rtProxy() const)
     UNIMPL(const GrSurfaceProxyView& writeView() const)
     UNIMPL(const GrAppliedClip* appliedClip() const)
+    UNIMPL(bool usesMSAASurface() const)
     UNIMPL(GrStrikeCache* strikeCache() const)
     UNIMPL(GrAtlasManager* atlasManager() const)
     UNIMPL(SkTArray<GrSurfaceProxy*, true>* sampledProxyArray())