Revert of Move DstCoordTexture to GrXP, rename and remove the word "copy" from dstcopytexture names.

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 cb6d303d7324285782ef96ef24107998df373f68..cb7f4974be29adaca271d8357b5dab9600ebea4a 100644
--- a/src/gpu/effects/GrCoverageSetOpXP.cpp
+++ b/src/gpu/effects/GrCoverageSetOpXP.cpp
@@ -226,8 +226,7 @@
 GrCoverageSetOpXPFactory::onCreateXferProcessor(const GrCaps& caps,
                                                 const GrProcOptInfo& colorPOI,
                                                 const GrProcOptInfo& covPOI,
-                                                const DstTexture* dst) const {
-    SkASSERT(!dst);
+                                                const GrDeviceCoordTexture* dstCopy) const {
     return CoverageSetOpXP::Create(fRegionOp, fInvertCoverage);
 }