Revert "Move DstCopy on gpu into the GrXferProcessor."

src/gpu/GrPipelineBuilder.cpp

Index: src/gpu/GrPipelineBuilder.cpp
diff --git a/src/gpu/GrPipelineBuilder.cpp b/src/gpu/GrPipelineBuilder.cpp
index 54d357fd23d72c58fe5eb154245146ae5ecc9dbb..90aee748c9108411b46ede0dbe2ef7059e6045d5 100644
--- a/src/gpu/GrPipelineBuilder.cpp
+++ b/src/gpu/GrPipelineBuilder.cpp
@@ -101,8 +101,8 @@ bool GrPipelineBuilder::canUseFracCoveragePrimProc(GrColor color,
 
 //////////////////////////////////////////////////////////////////////////////s
 
-bool GrPipelineBuilder::willXPNeedDstCopy(const GrDrawTargetCaps& caps) const {
-    return this->getXPFactory()->willNeedDstCopy(caps);
+bool GrPipelineBuilder::willEffectReadDstColor() const {
+    return this->getXPFactory()->willReadDst();
 }
 
 void GrPipelineBuilder::AutoRestoreEffects::set(GrPipelineBuilder* pipelineBuilder) {