add a ClassID function to GrBatch

src/gpu/batches/GrTestBatch.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 GrTestBatch_DEFINED
 #define GrTestBatch_DEFINED
 
@@ skipping 32 matching lines @@
         opt.getOverrideColorIfSet(&this->geoData(0)->fColor);
 
         // setup batch properties
         fBatch.fColorIgnored = !opt.readsColor();
         fBatch.fColor = this->geoData(0)->fColor;
         fBatch.fUsesLocalCoords = opt.readsLocalCoords();
         fBatch.fCoverageIgnored = !opt.readsCoverage();
     }
 
 protected:
-    GrTestBatch(const GrGeometryProcessor* gp, const SkRect& bounds) {
+    GrTestBatch(uint32_t classID, const GrGeometryProcessor* gp, const SkRect& bounds)
+        : INHERITED(classID) {
         fGeometryProcessor.reset(SkRef(gp));
 
         this->setBounds(bounds);
     }
 
     const GrGeometryProcessor* geometryProcessor() const { return fGeometryProcessor; }
 
 private:
     void onPrepareDraws(Target* target) override {
         target->initDraw(fGeometryProcessor, this->pipeline());
@@ skipping 11 matching lines @@
 
     struct BatchTracker {
         GrColor fColor;
         bool fUsesLocalCoords;
         bool fColorIgnored;
         bool fCoverageIgnored;
     };
 
     SkAutoTUnref<const GrGeometryProcessor> fGeometryProcessor;
     BatchTracker fBatch;
+
+    typedef GrVertexBatch INHERITED;
 };
 
 #endif