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 24 matching lines @@
  *     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:
     typedef typename Impl::Geometry Geometry;
 
+    BATCH_CLASS_ID
+
     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);
     }
 
     void getInvariantOutputCoverage(GrInitInvariantOutput* out) const override {
@@ skipping 77 matching lines @@
         fGeoData.push_back_n(that->geoData()->count(), that->geoData()->begin());
         this->joinBounds(that->bounds());
         return true;
     }
 
     GrPipelineOptimizations fOpts;
     SkSTArray<1, Geometry, true> fGeoData;
 };
 
 #endif