Reland of add a ClassID function to GrBatch

src/gpu/batches/GrDrawAtlasBatch.h

Index: src/gpu/batches/GrDrawAtlasBatch.h
diff --git a/src/gpu/batches/GrDrawAtlasBatch.h b/src/gpu/batches/GrDrawAtlasBatch.h
index 9a864c01c9c859457015e97d54cae8b8edb7a084..de128f211db1ccc9e7b245f77c64faaa08e67df0 100644
--- a/src/gpu/batches/GrDrawAtlasBatch.h
+++ b/src/gpu/batches/GrDrawAtlasBatch.h
@@ -14,11 +14,13 @@
 
 class GrDrawAtlasBatch : public GrVertexBatch {
 public:
+    DEFINE_BATCH_CLASS_ID
+
     struct Geometry {
         GrColor                 fColor;
         SkTArray<uint8_t, true> fVerts;
     };
-    
+
     static GrDrawBatch* Create(const Geometry& geometry, const SkMatrix& viewMatrix,
                                int spriteCount, const SkRSXform* xforms, const SkRect* rects,
                                const SkColor* colors) {
@@ -66,6 +68,8 @@
     bool     fColorIgnored;
     bool     fCoverageIgnored;
     bool     fHasColors;
+
+    typedef GrVertexBatch INHERITED;
 };
 
 #endif