add a ClassID function to GrBatch

src/gpu/batches/GrDrawVerticesBatch.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 GrDrawVerticesBatch_DEFINED
 #define GrDrawVerticesBatch_DEFINED
 
@@ skipping 10 matching lines @@
 class GrDrawVerticesBatch : public GrVertexBatch {
 public:
     struct Geometry {
         GrColor fColor;
         SkTDArray<SkPoint> fPositions;
         SkTDArray<uint16_t> fIndices;
         SkTDArray<GrColor> fColors;
         SkTDArray<SkPoint> fLocalCoords;
     };
 
+    BATCH_CLASS_ID
+
     static GrDrawBatch* Create(const Geometry& geometry, GrPrimitiveType primitiveType,
                                const SkMatrix& viewMatrix,
                                const SkPoint* positions, int vertexCount,
                                const uint16_t* indices, int indexCount,
                                const GrColor* colors, const SkPoint* localCoords,
                                const SkRect& bounds) {
         return new GrDrawVerticesBatch(geometry, primitiveType, viewMatrix, positions, vertexCount,
                                        indices, indexCount, colors, localCoords, bounds);
     }
 
@@ skipping 46 matching lines @@
         bool fHasLocalCoords;
         int fVertexCount;
         int fIndexCount;
     };
 
     BatchTracker fBatch;
     SkSTArray<1, Geometry, true> fGeoData;
 };
 
 #endif