Remove willReadDst from GrFragmentProcessor.

src/gpu/gl/builders/GrGLProgramBuilder.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrGLProgramBuilder.h"
 #include "gl/GrGLProgram.h"
 #include "gl/GrGLSLPrettyPrint.h"
@@ skipping 341 matching lines @@
     // asks for dst color, then the emit code needs to follow suit
     verify(xp);
     fFS.codeAppend("}");
 }
 
 void GrGLProgramBuilder::verify(const GrPrimitiveProcessor& gp) {
     SkASSERT(fFS.hasReadFragmentPosition() == gp.willReadFragmentPosition());
 }
 
 void GrGLProgramBuilder::verify(const GrXferProcessor& xp) {
-    // TODO: Once will readDst is only xp enable this assert and remove it from the
-    // FragmentProcessor verify()
-    //SkASSERT(fFS.hasReadDstColor() == xp.willReadDstColor());
+    SkASSERT(fFS.hasReadDstColor() == xp.willReadDstColor());
 }
 
 void GrGLProgramBuilder::verify(const GrFragmentProcessor& fp) {
     SkASSERT(fFS.hasReadFragmentPosition() == fp.willReadFragmentPosition());
-    SkASSERT(fFS.hasReadDstColor() == fp.willReadDstColor());
 }
 
 template <class Proc>
 void GrGLProgramBuilder::emitSamplers(const GrProcessor& processor,
                                       GrGLProcessor::TextureSamplerArray* outSamplers,
                                       GrGLInstalledProc<Proc>* ip) {
     int numTextures = processor.numTextures();
     ip->fSamplers.push_back_n(numTextures);
     SkString name;
     for (int t = 0; t < numTextures; ++t) {
@@ skipping 118 matching lines @@
 }
 
 ///////////////////////////////////////////////////////////////////////////////////////////////////
 
 GrGLInstalledFragProcs::~GrGLInstalledFragProcs() {
     int numProcs = fProcs.count();
     for (int e = 0; e < numProcs; ++e) {
         SkDELETE(fProcs[e]);
     }
 }