Use static XPF for porter duff xp factories.

src/gpu/GrPaint.cpp

 
 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrPaint.h"
 
@@ skipping 34 matching lines @@
             *color = tempColor;
             return true;
         }
     }
     return false;
 }
 
 void GrPaint::resetStages() {
     fColorStages.reset();
     fCoverageStages.reset();
-    fXPFactory.reset(GrPorterDuffXPFactory::Create(kOne_GrBlendCoeff,
-                                                   kZero_GrBlendCoeff));
+    fXPFactory.reset(GrPorterDuffXPFactory::Create(SkXfermode::kSrcOver_Mode));
 }
 
 bool GrPaint::getOpaqueAndKnownColor(GrColor* solidColor,
                                      uint32_t* solidColorKnownComponents) const {
 
     // TODO: Share this implementation with GrDrawState
     
     GrProcOptInfo coverageProcInfo;
     coverageProcInfo.calcWithInitialValues(fCoverageStages.begin(), this->numCoverageStages(),
                                            0xFFFFFFFF, kRGBA_GrColorComponentFlags, true);
@@ skipping 49 matching lines @@
                     *solidColorKnownComponents = 0;
                     break;
             }
         } else {
             solidColorKnownComponents = 0;
         }
     }
     return opaque;
 }