Use static XPF for porter duff xp factories.

src/gpu/effects/GrPorterDuffXferProcessor.h

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrPorterDuffXferProcessor_DEFINED
 #define GrPorterDuffXferProcessor_DEFINED
 
@@ skipping 35 matching lines @@
     GrBlendCoeff fSrcBlend;
     GrBlendCoeff fDstBlend;
     
     typedef GrXferProcessor INHERITED;
 };
 
 ///////////////////////////////////////////////////////////////////////////////
 
 class GrPorterDuffXPFactory : public GrXPFactory {
 public:
+    static GrXPFactory* Create(SkXfermode::Mode mode); 
+
     static GrXPFactory* Create(SkXfermode::Coeff src, SkXfermode::Coeff dst) {
         return SkNEW_ARGS(GrPorterDuffXPFactory, ((GrBlendCoeff)(src), (GrBlendCoeff)(dst)));
     }
 
     static GrXPFactory* Create(GrBlendCoeff src, GrBlendCoeff dst) {
         return SkNEW_ARGS(GrPorterDuffXPFactory, (src, dst));
     }
 
     const GrXferProcessor* createXferProcessor() const SK_OVERRIDE;
 
     bool supportsRGBCoverage(GrColor knownColor, uint32_t knownColorFlags) const SK_OVERRIDE;
 
 private:
     GrPorterDuffXPFactory(GrBlendCoeff src, GrBlendCoeff dst)
         : fSrc(src), fDst(dst) {}
 
     GrBlendCoeff fSrc;
     GrBlendCoeff fDst;
 
     typedef GrXPFactory INHERITED;
 };
 
 #endif