Revert of removing equality / compute invariant loops from GrGeometryProcessors

src/gpu/GrTestBatch.h

Index: src/gpu/GrTestBatch.h
diff --git a/src/gpu/GrTestBatch.h b/src/gpu/GrTestBatch.h
index ccc0b94e587bb9e6f6c1da5b402d0166d53ebb9b..716912dc7687f88c35de9e9df2ed18c2708c7ef9 100644
--- a/src/gpu/GrTestBatch.h
+++ b/src/gpu/GrTestBatch.h
@@ -24,7 +24,7 @@
 
     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());
@@ -67,8 +67,7 @@
     }
 
 protected:
-    GrTestBatch(const GrGeometryProcessor* gp, bool hasVertexColor = false)
-        : fHasVertexColor(hasVertexColor) {
+    GrTestBatch(const GrGeometryProcessor* gp) {
         fGeometryProcessor.reset(SkRef(gp));
     }
 
@@ -90,7 +89,6 @@
         bool fCoverageIgnored;
     };
 
-    bool fHasVertexColor;
     SkAutoTUnref<const GrGeometryProcessor> fGeometryProcessor;
     BatchTracker fBatch;
 };