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

src/gpu/GrPipeline.h

Index: src/gpu/GrPipeline.h
diff --git a/src/gpu/GrPipeline.h b/src/gpu/GrPipeline.h
index 24d0b627951b6fb128bfab83fa45a09b19f75a60..8480c0045856ba4f3b7977d22d7a0955e62754ed 100644
--- a/src/gpu/GrPipeline.h
+++ b/src/gpu/GrPipeline.h
@@ -132,9 +132,7 @@
 
     ///////////////////////////////////////////////////////////////////////////
 
-    const GrDeviceCoordTexture* getDstCopy() const { return fDstCopy.texture() ? &fDstCopy : NULL; }
-
-    const GrProgramDesc::DescInfo& descInfo() const { return fDescInfo; }
+    bool readsFragPosition() const { return fReadsFragPosition; }
 
     const GrPipelineInfo& getInitBatchTracker() const { return fInitBT; }
 
@@ -177,11 +175,10 @@
     GrScissorState                      fScissorState;
     GrStencilSettings                   fStencilSettings;
     GrPipelineBuilder::DrawFace         fDrawFace;
-    GrDeviceCoordTexture                fDstCopy;
     uint32_t                            fFlags;
     ProgramXferProcessor                fXferProcessor;
     FragmentStageArray                  fFragmentStages;
-    GrProgramDesc::DescInfo             fDescInfo;
+    bool                                fReadsFragPosition;
     GrPipelineInfo                      fInitBT;
 
     // This function is equivalent to the offset into fFragmentStages where coverage stages begin.