Reland of add a ClassID function to GrBatch

src/gpu/batches/GrTestBatch.h

Index: src/gpu/batches/GrTestBatch.h
diff --git a/src/gpu/batches/GrTestBatch.h b/src/gpu/batches/GrTestBatch.h
index 085b184a28639e917d4d86c22aad486bbea644a8..02881c9668ed2c1d0a78355990a045b625baf52b 100644
--- a/src/gpu/batches/GrTestBatch.h
+++ b/src/gpu/batches/GrTestBatch.h
@@ -50,7 +50,8 @@
     }
 
 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);
@@ -82,6 +83,8 @@
 
     SkAutoTUnref<const GrGeometryProcessor> fGeometryProcessor;
     BatchTracker fBatch;
+
+    typedef GrVertexBatch INHERITED;
 };
 
 #endif