Reland of add a ClassID function to GrBatch

src/gpu/batches/GrVertexBatch.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrVertexBatch.h"
 #include "GrBatchFlushState.h"
 #include "GrResourceProvider.h"
 
-GrVertexBatch::GrVertexBatch() : fDrawArrays(1) {}
+GrVertexBatch::GrVertexBatch(uint32_t classID) : INHERITED(classID), fDrawArrays(1) {}
 
 void GrVertexBatch::onPrepare(GrBatchFlushState* state) {
     Target target(state, this);
     this->onPrepareDraws(&target);
 }
 
 void* GrVertexBatch::InstancedHelper::init(Target* target, GrPrimitiveType primType,
                                            size_t vertexStride, const GrIndexBuffer* indexBuffer,
                                            int verticesPerInstance, int indicesPerInstance,
                                            int instancesToDraw) {
@@ skipping 54 matching lines @@
         const GrPrimitiveProcessor* primProc = drawArray.fPrimitiveProcessor.get();
         state->gpu()->buildProgramDesc(&desc, *primProc, *pipeline);
         GrGpu::DrawArgs args(primProc, pipeline, &desc);
 
         int drawCount = drawArray.fDraws.count();
         for (int i = 0; i < drawCount; i++) {
             state->gpu()->draw(args,  drawArray.fDraws[i]);
         }
     }
 }