Reland of add a ClassID function to GrBatch

src/gpu/batches/GrCopySurfaceBatch.h

Index: src/gpu/batches/GrCopySurfaceBatch.h
diff --git a/src/gpu/batches/GrCopySurfaceBatch.h b/src/gpu/batches/GrCopySurfaceBatch.h
index 584bbab5d7b805d656b68f992db30b2ae54da13f..ed5e77f5b061d9bce393c3a30f4f2f3eeffe410a 100644
--- a/src/gpu/batches/GrCopySurfaceBatch.h
+++ b/src/gpu/batches/GrCopySurfaceBatch.h
@@ -15,6 +15,8 @@
 
 class GrCopySurfaceBatch final : public GrBatch {
 public:
+    DEFINE_BATCH_CLASS_ID
+
     static GrBatch* Create(GrSurface* dst, GrSurface* src, const SkIRect& srcRect,
                            const SkIPoint& dstPoint);
 
@@ -37,11 +39,11 @@
 private:
     GrCopySurfaceBatch(GrSurface* dst, GrSurface* src, const SkIRect& srcRect,
                        const SkIPoint& dstPoint)
-        : fDst(dst)
+        : INHERITED(ClassID())
+        , fDst(dst)
         , fSrc(src)
         , fSrcRect(srcRect)
         , fDstPoint(dstPoint) {
-        this->initClassID<GrCopySurfaceBatch>();        
         fBounds = SkRect::MakeXYWH(SkIntToScalar(dstPoint.fX), SkIntToScalar(dstPoint.fY),
                                    SkIntToScalar(srcRect.width()), SkIntToScalar(srcRect.height()));
     }
@@ -58,6 +60,8 @@
     GrPendingIOResource<GrSurface, kRead_GrIOType>  fSrc;
     SkIRect                                         fSrcRect;
     SkIPoint                                        fDstPoint;
+
+    typedef GrBatch INHERITED;
 };
 
 #endif