add a ClassID function to GrBatch

src/gpu/batches/GrStrokeRectBatch.cpp

Index: src/gpu/batches/GrStrokeRectBatch.cpp
diff --git a/src/gpu/batches/GrStrokeRectBatch.cpp b/src/gpu/batches/GrStrokeRectBatch.cpp
index 766302bf5b5b251b52a0163b2a224099ec432a67..20c754c8996582d96e395a35e64bd89ea5523da2 100644
--- a/src/gpu/batches/GrStrokeRectBatch.cpp
+++ b/src/gpu/batches/GrStrokeRectBatch.cpp
@@ -10,9 +10,8 @@
 #include "GrBatchFlushState.h"
 #include "SkRandom.h"
 
-GrStrokeRectBatch::GrStrokeRectBatch(const Geometry& geometry, bool snapToPixelCenters) {
-    this->initClassID<GrStrokeRectBatch>();
-
+GrStrokeRectBatch::GrStrokeRectBatch(const Geometry& geometry, bool snapToPixelCenters)
+    : INHERITED(ClassID()) {
     fBatch.fHairline = geometry.fStrokeWidth == 0;
 
     fGeoData.push_back(geometry);