add a ClassID function to GrBatch

src/gpu/batches/GrAALinearizingConvexPathRenderer.cpp

Index: src/gpu/batches/GrAALinearizingConvexPathRenderer.cpp
diff --git a/src/gpu/batches/GrAALinearizingConvexPathRenderer.cpp b/src/gpu/batches/GrAALinearizingConvexPathRenderer.cpp
index d05fe4e90843c56761760698cea115ae283cdde0..66ac1e0bb27fe47ddcff9360b32d2783c105c247 100644
--- a/src/gpu/batches/GrAALinearizingConvexPathRenderer.cpp
+++ b/src/gpu/batches/GrAALinearizingConvexPathRenderer.cpp
@@ -128,6 +128,8 @@ public:
         SkScalar fMiterLimit;
     };
 
+    BATCH_CLASS_ID
+
     static GrDrawBatch* Create(const Geometry& geometry) {
         return new AAFlatteningConvexPathBatch(geometry);
     }