add a ClassID function to GrBatch

src/gpu/batches/GrTInstanceBatch.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrTInstanceBatch_DEFINED
 #define GrTInstanceBatch_DEFINED
 
@@ skipping 22 matching lines @@
  *                                         const GrPipelineOptimizations& opts)
  *
  *     const GrIndexBuffer* GetIndexBuffer(GrResourceProvider*)
  *
  *     Tesselate(intptr_t vertices, size_t vertexStride, const Geometry& geo,
  *               const GrPipelineOptimizations& opts)
  */
 template <typename Impl>
 class GrTInstanceBatch : public GrVertexBatch {
 public:
+    DEFINE_BATCH_CLASS_ID
+
     typedef typename Impl::Geometry Geometry;
 
     static GrTInstanceBatch* Create() { return new GrTInstanceBatch; }
 
     const char* name() const override { return Impl::Name(); }
 
     void getInvariantOutputColor(GrInitInvariantOutput* out) const override {
         // When this is called on a batch, there is only one geometry bundle
         out->setKnownFourComponents(fGeoData[0].fColor);
     }
@@ skipping 12 matching lines @@
     // to avoid even the initial copy of the struct, we have a getter for the first item which
     // is used to seed the batch with its initial geometry.  After seeding, the client should call
     // init() so the Batch can initialize itself
     Geometry* geometry() { return &fGeoData[0]; }
     void init() {
         const Geometry& geo = fGeoData[0];
         Impl::SetBounds(geo, &fBounds);
     }
 
 private:
-    GrTInstanceBatch() {
-        this->initClassID<GrTInstanceBatch<Impl>>();
-
+    GrTInstanceBatch() : INHERITED(ClassID()) {
         // Push back an initial geometry
         fGeoData.push_back();
     }
 
     void onPrepareDraws(Target* target) override {
         SkAutoTUnref<const GrGeometryProcessor> gp(Impl::CreateGP(this->seedGeometry(), fOpts));
         if (!gp) {
             SkDebugf("Couldn't create GrGeometryProcessor\n");
             return;
         }
@@ skipping 41 matching lines @@
             fOpts = that->fOpts;
         }
 
         fGeoData.push_back_n(that->geoData()->count(), that->geoData()->begin());
         this->joinBounds(that->bounds());
         return true;
     }
 
     GrPipelineOptimizations fOpts;
     SkSTArray<1, Geometry, true> fGeoData;
+
+    typedef GrVertexBatch INHERITED;
 };
 
 #endif