Add XferProcessor factory in GrPaint and GrDrawState.

src/gpu/GrOptDrawState.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrOptDrawState.h"
 
 #include "GrDefaultGeoProcFactory.h"
@@ skipping 88 matching lines @@
         this->removeFixedFunctionVertexAttribs(fixedFunctionVAToRemove, &descInfo);
     }
     this->getStageStats(drawState, firstColorStageIdx, firstCoverageStageIdx, &descInfo);
 
     // Copy GeometryProcesssor from DS or ODS
     SkASSERT(GrGpu::IsPathRenderingDrawType(drawType) ||
              GrGpu::kStencilPath_DrawType ||
              drawState.hasGeometryProcessor());
     fGeometryProcessor.reset(drawState.getGeometryProcessor());
 
+    // Create XferProcessor from DS's XPFactory
+    const GrXferProcessor* xpProcessor = drawState.getXPFactory()->createXferProcessor();
+    fXferProcessor.reset(xpProcessor);
+    xpProcessor->unref();
+
     // Copy Stages from DS to ODS
     bool explicitLocalCoords = descInfo.hasLocalCoordAttribute();
 
     for (int i = firstColorStageIdx; i < drawState.numColorStages(); ++i) {
         SkNEW_APPEND_TO_TARRAY(&fFragmentStages,
                                GrPendingFragmentStage,
                                (drawState.fColorStages[i], explicitLocalCoords));
     }
     fNumColorStages = fFragmentStages.count();
     for (int i = firstCoverageStageIdx; i < drawState.numCoverageStages(); ++i) {
@@ skipping 188 matching lines @@
     SkASSERT(this->numFragmentStages() == that.numFragmentStages());
     for (int i = 0; i < this->numFragmentStages(); i++) {
 
         if (this->getFragmentStage(i) != that.getFragmentStage(i)) {
             return false;
         }
     }
     return true;
 }