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

src/gpu/gl/GrGLProgramDesc.h

Index: src/gpu/gl/GrGLProgramDesc.h
diff --git a/src/gpu/gl/GrGLProgramDesc.h b/src/gpu/gl/GrGLProgramDesc.h
index e4db4c3581ce8a81195af0eaeee35b0fbd568fb5..f2371556bfaf19a178b67594795ba92144316201 100644
--- a/src/gpu/gl/GrGLProgramDesc.h
+++ b/src/gpu/gl/GrGLProgramDesc.h
@@ -47,8 +47,6 @@
      *                        general draw information, as well as the specific color, geometry,
      *                        and coverage stages which will be used to generate the GL Program for
      *                        this optstate.
-     * @param DescInfo  A descriptor info struct, generated by the optstate, which contains a number
-     *                  of important facts about the program the built descriptor will represent
      * @param GrGLGpu  A GL Gpu, the caps and Gpu object are used to output processor specific
      *                 parts of the descriptor.
      * @param GrDeviceCoordTexture  A dstCopy texture, which may be null if frame buffer fetch is
@@ -58,7 +56,6 @@
     static bool Build(GrProgramDesc*,
                       const GrPrimitiveProcessor&,
                       const GrPipeline&,
-                      const GrProgramDesc::DescInfo&,
                       const GrGLGpu*,
                       const GrBatchTracker&);
 };