add a ClassID function to GrBatch

src/gpu/effects/GrDashingEffect.cpp

Index: src/gpu/effects/GrDashingEffect.cpp
diff --git a/src/gpu/effects/GrDashingEffect.cpp b/src/gpu/effects/GrDashingEffect.cpp
index 3ca4c7ae4b6379a1042767c39b6498e1a7bc9ad2..10d28bc861de20167d7cbdcb268cb84c556e4a86 100644
--- a/src/gpu/effects/GrDashingEffect.cpp
+++ b/src/gpu/effects/GrDashingEffect.cpp
@@ -257,6 +257,8 @@ public:
         SkScalar fPerpendicularScale;
     };
 
+    BATCH_CLASS_ID
+
     static GrDrawBatch* Create(const Geometry& geometry, SkPaint::Cap cap, DashAAMode aaMode,
                                bool fullDash) {
         return new DashBatch(geometry, cap, aaMode, fullDash);