Revert of removing equality / compute invariant loops from GrGeometryProcessors

src/gpu/GrAAConvexPathRenderer.cpp

Index: src/gpu/GrAAConvexPathRenderer.cpp
diff --git a/src/gpu/GrAAConvexPathRenderer.cpp b/src/gpu/GrAAConvexPathRenderer.cpp
index 5a470213d4ba7ac9302c0592dc8ed2c5f0fcaccb..def69a04b99d108f96d3f6be3ff0addbcc5ddd61 100644
--- a/src/gpu/GrAAConvexPathRenderer.cpp
+++ b/src/gpu/GrAAConvexPathRenderer.cpp
@@ -623,12 +623,31 @@
         local->fUsesLocalCoords = init.fUsesLocalCoords;
     }
 
+    bool onCanMakeEqual(const GrBatchTracker& m,
+                        const GrGeometryProcessor& that,
+                        const GrBatchTracker& t) const override {
+        const BatchTracker& mine = m.cast<BatchTracker>();
+        const BatchTracker& theirs = t.cast<BatchTracker>();
+        return CanCombineLocalMatrices(*this, mine.fUsesLocalCoords,
+                                       that, theirs.fUsesLocalCoords) &&
+               CanCombineOutput(mine.fInputColorType, mine.fColor,
+                                theirs.fInputColorType, theirs.fColor);
+    }
+
 private:
     QuadEdgeEffect(GrColor color, const SkMatrix& localMatrix)
         : INHERITED(color, SkMatrix::I(), localMatrix) {
         this->initClassID<QuadEdgeEffect>();
         fInPosition = &this->addVertexAttrib(Attribute("inPosition", kVec2f_GrVertexAttribType));
         fInQuadEdge = &this->addVertexAttrib(Attribute("inQuadEdge", kVec4f_GrVertexAttribType));
+    }
+
+    bool onIsEqual(const GrGeometryProcessor& other) const override {
+        return true;
+    }
+
+    void onGetInvariantOutputCoverage(GrInitInvariantOutput* out) const override {
+        out->setUnknownSingleComponent();
     }
 
     struct BatchTracker {