Reland of add a ClassID function to GrBatch

src/gpu/batches/GrAALinearizingConvexPathRenderer.cpp

Index: src/gpu/batches/GrAALinearizingConvexPathRenderer.cpp
diff --git a/src/gpu/batches/GrAALinearizingConvexPathRenderer.cpp b/src/gpu/batches/GrAALinearizingConvexPathRenderer.cpp
index d05fe4e90843c56761760698cea115ae283cdde0..a7e98249e216b77327c8b0dec48ecf162497ef48 100644
--- a/src/gpu/batches/GrAALinearizingConvexPathRenderer.cpp
+++ b/src/gpu/batches/GrAALinearizingConvexPathRenderer.cpp
@@ -119,6 +119,8 @@
 
 class AAFlatteningConvexPathBatch : public GrVertexBatch {
 public:
+    DEFINE_BATCH_CLASS_ID
+
     struct Geometry {
         GrColor fColor;
         SkMatrix fViewMatrix;
@@ -258,8 +260,7 @@
 
     SkSTArray<1, Geometry, true>* geoData() { return &fGeoData; }
 
-    AAFlatteningConvexPathBatch(const Geometry& geometry) {
-        this->initClassID<AAFlatteningConvexPathBatch>();
+    AAFlatteningConvexPathBatch(const Geometry& geometry) : INHERITED(ClassID()) {
         fGeoData.push_back(geometry);
 
         // compute bounds
@@ -308,6 +309,8 @@
 
     BatchTracker fBatch;
     SkSTArray<1, Geometry, true> fGeoData;
+
+    typedef GrVertexBatch INHERITED;
 };
 
 bool GrAALinearizingConvexPathRenderer::onDrawPath(const DrawPathArgs& args) {