abstract name of clipping ops, to transtion to a more restricted set

src/core/SkLiteRecorder.h

Index: src/core/SkLiteRecorder.h
diff --git a/src/core/SkLiteRecorder.h b/src/core/SkLiteRecorder.h
index 7ec4f83bc546e83037e1ab8f835b6e0db8d82502..be278549a670c554f1a3b14225feaefdcd9250d9 100644
--- a/src/core/SkLiteRecorder.h
+++ b/src/core/SkLiteRecorder.h
@@ -31,10 +31,10 @@ public:
     void didSetMatrix(const SkMatrix&) override;
     void didTranslate(SkScalar, SkScalar) override;
 
-    void onClipRect  (const   SkRect&, SkRegion::Op, ClipEdgeStyle) override;
-    void onClipRRect (const  SkRRect&, SkRegion::Op, ClipEdgeStyle) override;
-    void onClipPath  (const   SkPath&, SkRegion::Op, ClipEdgeStyle) override;
-    void onClipRegion(const SkRegion&, SkRegion::Op) override;
+    void onClipRect  (const   SkRect&, ClipOp, ClipEdgeStyle) override;
+    void onClipRRect (const  SkRRect&, ClipOp, ClipEdgeStyle) override;
+    void onClipPath  (const   SkPath&, ClipOp, ClipEdgeStyle) override;
+    void onClipRegion(const SkRegion&, ClipOp) override;
 
     void onDrawPaint (const SkPaint&) override;
     void onDrawPath  (const SkPath&, const SkPaint&) override;