Revert of removing equality / compute invariant loops from GrGeometryProcessors

src/gpu/GrTestBatch.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrTestBatch_DEFINED
 #define GrTestBatch_DEFINED
 
 #include "GrBatch.h"
 
 /*
  * A simple batch only for testing purposes which actually doesn't batch at all, but can fit into
  * the batch pipeline and generate arbitrary geometry
  */
 class GrTestBatch : public GrBatch {
 public:
     struct Geometry {
         GrColor fColor;
     };
 
     virtual const char* name() const override = 0;
 
     void getInvariantOutputColor(GrInitInvariantOutput* out) const override {
         // When this is called on a batch, there is only one geometry bundle
-        if (fHasVertexColor) {
+        if (fGeometryProcessor->hasVertexColor()) {
             out->setUnknownFourComponents();
         } else {
             out->setKnownFourComponents(fGeometryProcessor->color());
         }
     }
 
     void getInvariantOutputCoverage(GrInitInvariantOutput* out) const override {
         out->setUnknownSingleComponent();
     }
 
@@ skipping 22 matching lines @@
         init.fColorIgnored = fBatch.fColorIgnored;
         init.fOverrideColor = GrColor_ILLEGAL;
         init.fCoverageIgnored = fBatch.fCoverageIgnored;
         init.fUsesLocalCoords = fBatch.fUsesLocalCoords;
         fGeometryProcessor->initBatchTracker(batchTarget->currentBatchTracker(), init);
 
         this->onGenerateGeometry(batchTarget, pipeline);
     }
 
 protected:
-    GrTestBatch(const GrGeometryProcessor* gp, bool hasVertexColor = false)
-        : fHasVertexColor(hasVertexColor) {
+    GrTestBatch(const GrGeometryProcessor* gp) {
         fGeometryProcessor.reset(SkRef(gp));
     }
 
     const GrGeometryProcessor* geometryProcessor() const { return fGeometryProcessor; }
 
 private:
     virtual Geometry* geoData(int index) = 0;
 
     bool onCombineIfPossible(GrBatch* t) override {
         return false;
     }
 
     virtual void onGenerateGeometry(GrBatchTarget* batchTarget, const GrPipeline* pipeline) = 0;
 
     struct BatchTracker {
         GrColor fColor;
         bool fUsesLocalCoords;
         bool fColorIgnored;
         bool fCoverageIgnored;
     };
 
-    bool fHasVertexColor;
     SkAutoTUnref<const GrGeometryProcessor> fGeometryProcessor;
     BatchTracker fBatch;
 };
 
 #endif