add a ClassID function to GrBatch

src/gpu/batches/GrAAConvexPathRenderer.cpp

Index: src/gpu/batches/GrAAConvexPathRenderer.cpp
diff --git a/src/gpu/batches/GrAAConvexPathRenderer.cpp b/src/gpu/batches/GrAAConvexPathRenderer.cpp
index 75bf33279061ef3e0ad6cec712ee953b8a9eb20d..543885e54ff57c5fcca6b600801629cf2f5c3c5f 100644
--- a/src/gpu/batches/GrAAConvexPathRenderer.cpp
+++ b/src/gpu/batches/GrAAConvexPathRenderer.cpp
@@ -733,6 +733,7 @@ static const GrGeometryProcessor* create_fill_gp(bool tweakAlphaForCoverage,
 
 class AAConvexPathBatch : public GrVertexBatch {
 public:
+    DEFINE_BATCH_CLASS_ID
     struct Geometry {
         GrColor fColor;
         SkMatrix fViewMatrix;
@@ -752,7 +753,6 @@ public:
     }
 
 private:
-
     void initBatchTracker(const GrPipelineOptimizations& opt) override {
         // Handle any color overrides
         if (!opt.readsColor()) {
@@ -921,8 +921,7 @@ private:
 
     SkSTArray<1, Geometry, true>* geoData() { return &fGeoData; }
 
-    AAConvexPathBatch(const Geometry& geometry) {
-        this->initClassID<AAConvexPathBatch>();
+    AAConvexPathBatch(const Geometry& geometry) : INHERITED(ClassID()) {
         fGeoData.push_back(geometry);
 
         // compute bounds
@@ -979,6 +978,8 @@ private:
 
     BatchTracker fBatch;
     SkSTArray<1, Geometry, true> fGeoData;
+
+    typedef GrVertexBatch INHERITED;
 };
 
 bool GrAAConvexPathRenderer::onDrawPath(const DrawPathArgs& args) {