Revert of Preliminary attempt to remove batch tracker

src/gpu/GrPathProcessor.h

Index: src/gpu/GrPathProcessor.h
diff --git a/src/gpu/GrPathProcessor.h b/src/gpu/GrPathProcessor.h
index 7c1ab2b5df82c539b16376e044ed328cb4b45716..e34d0cefbe5d2302ceb707dd32d6883902d4b561 100644
--- a/src/gpu/GrPathProcessor.h
+++ b/src/gpu/GrPathProcessor.h
@@ -57,6 +57,38 @@
 private:
     GrPathProcessor(GrColor color, const SkMatrix& viewMatrix, const SkMatrix& localMatrix);
 
+    /*
+     * CanCombineOutput will return true if two draws are 'batchable' from a color perspective.
+     * TODO is this really necessary?
+     */
+    static bool CanCombineOutput(GrGPInput left, GrColor lColor, GrGPInput right, GrColor rColor) {
+        if (left != right) {
+            return false;
+        }
+
+        if (kUniform_GrGPInput == left && lColor != rColor) {
+            return false;
+        }
+
+        return true;
+    }
+
+    static bool CanCombineLocalMatrices(const GrPrimitiveProcessor& l,
+                                        bool leftUsesLocalCoords,
+                                        const GrPrimitiveProcessor& r,
+                                        bool rightUsesLocalCoords) {
+        if (leftUsesLocalCoords != rightUsesLocalCoords) {
+            return false;
+        }
+
+        const GrPathProcessor& left = l.cast<GrPathProcessor>();
+        const GrPathProcessor& right = r.cast<GrPathProcessor>();
+        if (leftUsesLocalCoords && !left.localMatrix().cheapEqualTo(right.localMatrix())) {
+            return false;
+        }
+        return true;
+    }
+
     bool hasExplicitLocalCoords() const override { return false; }
 
     GrColor fColor;