Make GrGLShaderBuilder check whether GrEffect advertised that it would require the dst color or frag

tests/GLProgramsTest.cpp

 
 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 // This is a GPU-backend specific test. It relies on static intializers to work
 
@@ skipping 45 matching lines @@
 
     bool useLocalCoords = random->nextBool() && currAttribIndex < GrDrawState::kMaxVertexAttribCnt;
     fLocalCoordAttributeIndex = useLocalCoords ? currAttribIndex++ : -1;
 
     bool dstRead = false;
     for (int s = 0; s < GrDrawState::kNumStages; ++s) {
         if (NULL != stages[s]) {
             const GrBackendEffectFactory& factory = (*stages[s]->getEffect())->getFactory();
             GrDrawEffect drawEffect(*stages[s], useLocalCoords);
             fEffectKeys[s] = factory.glEffectKey(drawEffect, gpu->glCaps());
-            if ((*stages[s]->getEffect())->willReadDst()) {
+            if ((*stages[s]->getEffect())->willReadDstColor()) {
                 dstRead = true;
             }
         }
     }
 
     if (dstRead) {
         this->fDstRead = GrGLShaderBuilder::KeyForDstRead(dstTexture, gpu->glCaps());
     }
 
     CoverageOutput coverageOutput;
@@ skipping 118 matching lines @@
     SkMagnifierImageFilter mag(SkRect::MakeWH(SK_Scalar1, SK_Scalar1), SK_Scalar1);
     GrConfigConversionEffect::Create(NULL,
                                      false,
                                      GrConfigConversionEffect::kNone_PMConversion,
                                      SkMatrix::I());
     SkScalar matrix[20];
     SkColorMatrixFilter cmf(matrix);
 }
 
 #endif