Don't create a GXPFactory when blend is SrcOver

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 546 matching lines @@
         newCoverage = SkScalarRoundToInt(hairlineCoverage * 0xff);
 
         if (!stroke->isHairlineStyle()) {
             stroke.writable()->setHairlineStyle();
         }
     }
 
     const bool isHairline = stroke->isHairlineStyle();
 
     // Save the current xp on the draw state so we can reset it if needed
-    SkAutoTUnref<const GrXPFactory> backupXPFactory(SkRef(pipelineBuilder->getXPFactory()));
+    const GrXPFactory* xpFactory = pipelineBuilder->getXPFactory();
+    SkAutoTUnref<const GrXPFactory> backupXPFactory(SkSafeRef(xpFactory));
     // face culling doesn't make sense here
     SkASSERT(GrPipelineBuilder::kBoth_DrawFace == pipelineBuilder->getDrawFace());
 
     int                         passCount = 0;
     const GrStencilSettings*    passes[3];
     GrPipelineBuilder::DrawFace drawFace[3];
     bool                        reverse = false;
     bool                        lastPassIsBounds;
 
     if (isHairline) {
@@ skipping 184 matching lines @@
     geometry.fColor = color;
     geometry.fPath = path;
     geometry.fTolerance = srcSpaceTol;
 
     viewMatrix.mapRect(&bounds);
     uint8_t coverage = GrRandomCoverage(random);
     return DefaultPathBatch::Create(geometry, coverage, viewMatrix, true, bounds);
 }
 
 #endif