add a ClassID function to GrBatch

src/gpu/batches/GrStencilPathBatch.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 GrStencilPathBatch_DEFINED
 #define GrStencilPathBatch_DEFINED
 
 #include "GrBatch.h"
 #include "GrBatchFlushState.h"
 #include "GrGpu.h"
 #include "GrPath.h"
 #include "GrPathRendering.h"
 #include "GrRenderTarget.h"
 
 class GrStencilPathBatch final : public GrBatch {
 public:
     static GrBatch* Create(const SkMatrix& viewMatrix,
                            bool useHWAA,
                            const GrStencilSettings& stencil,
                            const GrScissorState& scissor,
                            GrRenderTarget* renderTarget,
                            const GrPath* path) {
         return new GrStencilPathBatch(viewMatrix, useHWAA, stencil, scissor, renderTarget, path);
     }
 
+    BATCH_CLASS_ID
+
     const char* name() const override { return "StencilPath"; }
 
     uint32_t renderTargetUniqueID() const override { return fRenderTarget.get()->getUniqueID(); }
 
     SkString dumpInfo() const override {
         SkString string;
         string.printf("PATH: 0x%p, AA:%d", fPath.get(), fUseHWAA);
         return string;
     }
 
@@ skipping 26 matching lines @@
 
     SkMatrix                                                fViewMatrix;
     bool                                                    fUseHWAA;
     GrStencilSettings                                       fStencil;
     GrScissorState                                          fScissor;
     GrPendingIOResource<GrRenderTarget, kWrite_GrIOType>    fRenderTarget;
     GrPendingIOResource<const GrPath, kRead_GrIOType>       fPath;
 };
 
 #endif