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

src/gpu/batches/GrDefaultPathRenderer.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrDefaultPathRenderer.h"
 
 #include "GrBatchFlushState.h"
@@ skipping 536 matching lines @@
                 }
             } else {
                 bounds = path.getBounds();
             }
             const SkMatrix& viewM = (reverse && viewMatrix.hasPerspective()) ? SkMatrix::I() :
                                                                                viewMatrix;
             SkAutoTUnref<GrDrawBatch> batch(
                     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]) {
                 pipelineBuilder.setUserStencil(passes[p]);
             } else {
                 pipelineBuilder.setUserStencil(userStencilSettings);
             }
 
             drawContext->drawBatch(pipelineBuilder, clip, batch);
         } else {
@@ skipping 68 matching lines @@
     SkRect bounds = path.getBounds();
     SkScalar tol = GrPathUtils::kDefaultTolerance;
     SkScalar srcSpaceTol = GrPathUtils::scaleToleranceToSrc(tol, viewMatrix, bounds);
 
     viewMatrix.mapRect(&bounds);
     uint8_t coverage = GrRandomCoverage(random);
     return new DefaultPathBatch(color, path, srcSpaceTol, coverage, viewMatrix, true, bounds);
 }
 
 #endif