Add gpu implementation of SkAvoidXfermode

src/effects/SkPixelXorXfermode.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 "SkPixelXorXfermode.h"
 #include "SkColorPriv.h"
 #include "SkReadBuffer.h"
@@ skipping 327 matching lines @@
     }
 
     GrXferProcessor* onCreateXferProcessor(const GrCaps& caps,
                                            const GrPipelineOptimizations& optimizations,
                                            bool hasMixedSamples,
                                            const DstTexture* dstTexture) const override {
         return new PixelXorXP(dstTexture, hasMixedSamples, fOpColor);
     }
 
     bool onWillReadDstColor(const GrCaps& caps,
-                          const GrPipelineOptimizations& optimizations,
-                          bool hasMixedSamples) const override {
+                            const GrPipelineOptimizations& optimizations,
+                            bool hasMixedSamples) const override {
         return true;
     }
 
     bool onIsEqual(const GrXPFactory& xpfBase) const override {
         const GrPixelXorXPFactory& xpf = xpfBase.cast<GrPixelXorXPFactory>();
         return fOpColor == xpf.fOpColor;
     }
 
     GR_DECLARE_XP_FACTORY_TEST;
 
@@ skipping 21 matching lines @@
 }
 
 bool SkPixelXorXfermode::asXPFactory(GrXPFactory** xpf) const {
     if (xpf) {
         *xpf = GrPixelXorXPFactory::Create(fOpColor);
     }
     return true;
 }
 
 #endif