Add choke point for modifying non-AA rect draws (e.g., applying clipping)

src/gpu/batches/GrDefaultPathRenderer.cpp

Index: src/gpu/batches/GrDefaultPathRenderer.cpp
diff --git a/src/gpu/batches/GrDefaultPathRenderer.cpp b/src/gpu/batches/GrDefaultPathRenderer.cpp
index a1fbc09e5f53d3429894f61471ce54a18d071df0..26c5ef311f77930d85a24e6e9f69c92a8be9cfe1 100644
--- a/src/gpu/batches/GrDefaultPathRenderer.cpp
+++ b/src/gpu/batches/GrDefaultPathRenderer.cpp
@@ -559,6 +559,7 @@ bool GrDefaultPathRenderer::internalDrawPath(GrDrawContext* drawContext,
                     GrRectBatchFactory::CreateNonAAFill(paint.getColor(), viewM, bounds, nullptr,
                                                         &localMatrix));
 
+            SkASSERT(GrPipelineBuilder::kBoth_DrawFace == drawFace[p]);
             GrPipelineBuilder pipelineBuilder(paint, drawContext->mustUseHWAA(paint));
             pipelineBuilder.setDrawFace(drawFace[p]);
             if (passes[p]) {