Revert of Revert of Move DstCopy on gpu into the GrXferProcessor. (patchset #1 id:1 of https://codereview.chromium.org/901663007/)

Reason for revert:
The revert didn't help the 10.9 bot. Unreverting by reverting the revert (which is basically relanding the original patch which itself was a revert of a revert). Revert.

Original issue's description:
> Revert of Move DstCopy on gpu into the GrXferProcessor. (patchset #11 id:200001 of https://codereview.chromium.org/885923002/)
>
> Reason for revert:
> Testing to see if reverting fixes 10.9 bots.
>
> Original issue's description:
> > Move DstCopy on gpu into the GrXferProcessor.
> >
> > BUG=skia:
> >
> > Committed: https://skia.googlesource.com/skia/+/74a11753604768bf461b80cabb66060e8564d82c
> >
> > Committed: https://skia.googlesource.com/skia/+/5e1378d0e075a323144ba14e0a4cbcca35eccc69
>
> TBR=joshualitt@google.com,egdaniel@google.com
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=skia:
>
> Committed: https://skia.googlesource.com/skia/+/21b2c53218ab25f4268e3992e51d916076a2a7ee

TBR=joshualitt@google.com,egdaniel@google.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Review URL: https://codereview.chromium.org/873723009
diff --git a/src/gpu/GrPipelineBuilder.cpp b/src/gpu/GrPipelineBuilder.cpp
index 90aee74..54d357f 100644
--- a/src/gpu/GrPipelineBuilder.cpp
+++ b/src/gpu/GrPipelineBuilder.cpp
@@ -101,8 +101,8 @@
 
 //////////////////////////////////////////////////////////////////////////////s
 
-bool GrPipelineBuilder::willEffectReadDstColor() const {
-    return this->getXPFactory()->willReadDst();
+bool GrPipelineBuilder::willXPNeedDstCopy(const GrDrawTargetCaps& caps) const {
+    return this->getXPFactory()->willNeedDstCopy(caps);
 }
 
 void GrPipelineBuilder::AutoRestoreEffects::set(GrPipelineBuilder* pipelineBuilder) {