Revert of Revert of Move DstCopy on gpu into the GrXferProcessor.

src/gpu/effects/GrCoverageSetOpXP.cpp

Index: src/gpu/effects/GrCoverageSetOpXP.cpp
diff --git a/src/gpu/effects/GrCoverageSetOpXP.cpp b/src/gpu/effects/GrCoverageSetOpXP.cpp
index fe286f6bf5ceef5e09ca05ea670d08a3126820d8..7025d20395f2af1b71327506e6b64bbc50756178 100644
--- a/src/gpu/effects/GrCoverageSetOpXP.cpp
+++ b/src/gpu/effects/GrCoverageSetOpXP.cpp
@@ -21,19 +21,6 @@
 
     ~GrGLCoverageSetOpXP() SK_OVERRIDE {}
 
-    void emitCode(const EmitArgs& args) SK_OVERRIDE {
-        const GrCoverageSetOpXP& xp = args.fXP.cast<GrCoverageSetOpXP>();
-        GrGLFPFragmentBuilder* fsBuilder = args.fPB->getFragmentShaderBuilder();
-
-        if (xp.invertCoverage()) {
-            fsBuilder->codeAppendf("%s = 1.0 - %s;", args.fOutputPrimary, args.fInputCoverage);
-        } else {
-            fsBuilder->codeAppendf("%s = %s;", args.fOutputPrimary, args.fInputCoverage);
-        }
-    }
-
-    void setData(const GrGLProgramDataManager&, const GrXferProcessor&) SK_OVERRIDE {};
-
     static void GenKey(const GrProcessor& processor, const GrGLCaps& caps,
                        GrProcessorKeyBuilder* b) {
         const GrCoverageSetOpXP& xp = processor.cast<GrCoverageSetOpXP>();
@@ -42,6 +29,19 @@
     };
 
 private:
+    void onEmitCode(const EmitArgs& args) SK_OVERRIDE {
+        const GrCoverageSetOpXP& xp = args.fXP.cast<GrCoverageSetOpXP>();
+        GrGLFPFragmentBuilder* fsBuilder = args.fPB->getFragmentShaderBuilder();
+
+        if (xp.invertCoverage()) {
+            fsBuilder->codeAppendf("%s = 1.0 - %s;", args.fOutputPrimary, args.fInputCoverage);
+        } else {
+            fsBuilder->codeAppendf("%s = %s;", args.fOutputPrimary, args.fInputCoverage);
+        }
+    }
+
+    void onSetData(const GrGLProgramDataManager&, const GrXferProcessor&) SK_OVERRIDE {};
+
     typedef GrGLXferProcessor INHERITED;
 };
 
@@ -56,7 +56,7 @@
 GrCoverageSetOpXP::~GrCoverageSetOpXP() {
 }
 
-void GrCoverageSetOpXP::getGLProcessorKey(const GrGLCaps& caps, GrProcessorKeyBuilder* b) const {
+void GrCoverageSetOpXP::onGetGLProcessorKey(const GrGLCaps& caps, GrProcessorKeyBuilder* b) const {
     GrGLCoverageSetOpXP::GenKey(*this, caps, b);
 }
 
@@ -179,8 +179,10 @@
     }
 }
 
-GrXferProcessor* GrCoverageSetOpXPFactory::createXferProcessor(const GrProcOptInfo& /* colorPOI*/,
-                                                               const GrProcOptInfo& covPOI) const {
+GrXferProcessor*
+GrCoverageSetOpXPFactory::onCreateXferProcessor(const GrProcOptInfo& colorPOI,
+                                                const GrProcOptInfo& covPOI,
+                                                const GrDeviceCoordTexture* dstCopy) const {
     return GrCoverageSetOpXP::Create(fRegionOp, fInvertCoverage);
 }