Move DstCopy on gpu into the GrXferProcessor.

src/effects/SkArithmeticMode_gpu.cpp

Index: src/effects/SkArithmeticMode_gpu.cpp
diff --git a/src/effects/SkArithmeticMode_gpu.cpp b/src/effects/SkArithmeticMode_gpu.cpp
index 48b7bcd61026fbd68d6f22bf1473d7ff68df4035..8022d668b4a616c70fd7ab85be29df90245c3b08 100644
--- a/src/effects/SkArithmeticMode_gpu.cpp
+++ b/src/effects/SkArithmeticMode_gpu.cpp
@@ -166,7 +166,15 @@ public:
 
     ~GLArithmeticXP() SK_OVERRIDE {}
 
-    void emitCode(const EmitArgs& args) SK_OVERRIDE {
+    static void GenKey(const GrProcessor& processor, const GrGLCaps& caps,
+                       GrProcessorKeyBuilder* b) {
+        const GrArithmeticXP& arith = processor.cast<GrArithmeticXP>();
+        uint32_t key = arith.enforcePMColor() ? 1 : 0;
+        b->add32(key);
+    }
+
+private:
+    void onEmitCode(const EmitArgs& args) SK_OVERRIDE {
         GrGLFPFragmentBuilder* fsBuilder = args.fPB->getFragmentShaderBuilder();
 
         const char* dstColor = fsBuilder->dstColor();
@@ -184,21 +192,13 @@ public:
                                args.fInputCoverage, dstColor);
     }
 
-    void setData(const GrGLProgramDataManager& pdman,
-                 const GrXferProcessor& processor) SK_OVERRIDE {
+    void onSetData(const GrGLProgramDataManager& pdman,
+                   const GrXferProcessor& processor) SK_OVERRIDE {
         const GrArithmeticXP& arith = processor.cast<GrArithmeticXP>();
         pdman.set4f(fKUni, arith.k1(), arith.k2(), arith.k3(), arith.k4());
         fEnforcePMColor = arith.enforcePMColor();
     };
 
-    static void GenKey(const GrProcessor& processor, const GrGLCaps& caps,
-                       GrProcessorKeyBuilder* b) {
-        const GrArithmeticXP& arith = processor.cast<GrArithmeticXP>();
-        uint32_t key = arith.enforcePMColor() ? 1 : 0;
-        b->add32(key);
-    }
-
-private:
     GrGLProgramDataManager::UniformHandle fKUni;
     bool fEnforcePMColor;
 
@@ -207,17 +207,18 @@ private:
 
 ///////////////////////////////////////////////////////////////////////////////
 
-GrArithmeticXP::GrArithmeticXP(float k1, float k2, float k3, float k4, bool enforcePMColor)
-    : fK1(k1)
+GrArithmeticXP::GrArithmeticXP(float k1, float k2, float k3, float k4, bool enforcePMColor,
+                               const GrDeviceCoordTexture* dstCopy, bool willReadDstColor)
+    : INHERITED(dstCopy, willReadDstColor)
+    , fK1(k1)
     , fK2(k2)
     , fK3(k3)
     , fK4(k4)
     , fEnforcePMColor(enforcePMColor) {
     this->initClassID<GrPorterDuffXferProcessor>();
-    this->setWillReadDstColor();
 }
 
-void GrArithmeticXP::getGLProcessorKey(const GrGLCaps& caps, GrProcessorKeyBuilder* b) const {
+void GrArithmeticXP::onGetGLProcessorKey(const GrGLCaps& caps, GrProcessorKeyBuilder* b) const {
     GLArithmeticXP::GenKey(*this, caps, b);
 }