add a ClassID function to GrBatch

src/gpu/batches/GrStrokeRectBatch.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 GrStrokeRectBatch_DEFINED
 #define GrStrokeRectBatch_DEFINED
 
 #include "GrColor.h"
 #include "GrDefaultGeoProcFactory.h"
 #include "GrVertexBatch.h"
 
 class GrStrokeRectBatch : public GrVertexBatch {
 public:
+    DEFINE_BATCH_CLASS_ID
+
     struct Geometry {
         GrColor fColor;
         SkMatrix fViewMatrix;
         SkRect fRect;
         SkScalar fStrokeWidth;
     };
 
     static GrDrawBatch* Create(const Geometry& geometry, bool snapToPixelCenters) {
         return new GrStrokeRectBatch(geometry, snapToPixelCenters);
     }
@@ skipping 40 matching lines @@
         bool fColorIgnored;
         bool fCoverageIgnored;
         bool fHairline;
     };
 
     const static int kVertsPerHairlineRect = 5;
     const static int kVertsPerStrokeRect = 10;
 
     BatchTracker fBatch;
     SkSTArray<1, Geometry, true> fGeoData;
+
+    typedef GrVertexBatch INHERITED;
 };
 
 #endif