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

1 files changed, 0 insertions, 17 deletions

diff --git a/src/gpu/GrProgramDesc.h b/src/gpu/GrProgramDesc.h
index e07e116733..66e0e06b8c 100644
--- a/src/gpu/GrProgramDesc.h
+++ b/src/gpu/GrProgramDesc.h
@@ -55,9 +55,6 @@ public:
     }
 
     struct KeyHeader {
-        uint8_t                     fDstReadKey;   // set by GrGLShaderBuilder if there
-                                                   // are effects that must read the dst.
-                                                   // Otherwise, 0.
         uint8_t                     fFragPosKey;   // set by GrGLShaderBuilder if there are
                                                    // effects that read the fragment position.
                                                    // Otherwise, 0.
@@ -79,20 +76,6 @@ public:
     // This should really only be used internally, base classes should return their own headers
     const KeyHeader& header() const { return *this->atOffset<KeyHeader, kHeaderOffset>(); }
 
-    // A struct to communicate descriptor information to the program descriptor builder
-    struct DescInfo {
-        bool operator==(const DescInfo& that) const {
-            return fReadsDst == that.fReadsDst &&
-                   fReadsFragPosition == that.fReadsFragPosition;
-        }
-        bool operator!=(const DescInfo& that) const { return !(*this == that); };
-
-        // These flags give aggregated info on the processor stages that are used when building
-        // programs.
-        bool            fReadsDst;
-        bool            fReadsFragPosition;
-    };
-
 private:
     template<typename T, size_t OFFSET> T* atOffset() {
         return reinterpret_cast<T*>(reinterpret_cast<intptr_t>(fKey.begin()) + OFFSET);