Reland of add a ClassID function to GrBatch (patchset #1 id:1 of https://codereview.chromium.org/1353043002/ )

Reason for revert:
DEPS roll seems to have landed w/o this revert, so revert it again

Original issue's description:
> Revert of add a ClassID function to GrBatch (patchset #5 id:80001 of https://codereview.chromium.org/1352813003/ )
>
> Reason for revert:
> Speculative revert to unblock DEPS roll
>
> Original issue's description:
> > add a ClassID function to GrBatch
> >
> > BUG=skia:
> >
> > Committed: https://skia.googlesource.com/skia/+/4078d529e9e199eea13456db7bf3a63a104ab5b9
> >
> > Committed: https://skia.googlesource.com/skia/+/eb44d53cf96a7eaf103a98d76079ce1f5495e343
>
> TBR=robertphillips@google.com,bsalomon@google.com,joshualitt@google.com,joshualitt@chromium.org
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=skia:
>
> Committed: https://skia.googlesource.com/skia/+/48e3a45ade15c52c0c1a10cb00907dd444897745

TBR=robertphillips@google.com,bsalomon@google.com,joshualitt@google.com,joshualitt@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Review URL: https://codereview.chromium.org/1344373005
diff --git a/src/gpu/batches/GrDrawPathBatch.cpp b/src/gpu/batches/GrDrawPathBatch.cpp
index a47e665..c56c4ad 100644
--- a/src/gpu/batches/GrDrawPathBatch.cpp
+++ b/src/gpu/batches/GrDrawPathBatch.cpp
@@ -57,11 +57,10 @@
 
 GrDrawPathRangeBatch::GrDrawPathRangeBatch(const SkMatrix& viewMatrix, const SkMatrix& localMatrix,
                                            GrColor color, GrPathRangeDraw* pathRangeDraw)
-    : INHERITED(viewMatrix, color)
+    : INHERITED(ClassID(), viewMatrix, color)
     , fDraws(4)
     , fLocalMatrix(localMatrix) {
     SkDEBUGCODE(pathRangeDraw->fUsedInBatch = true;)
-    this->initClassID<GrDrawPathRangeBatch>();
     fDraws.addToHead(SkRef(pathRangeDraw));
     fTotalPathCount = pathRangeDraw->count();
     // Don't compute a bounding box. For dst copy texture, we'll opt instead for it to just copy