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

include/utils/SkDumpCanvas.h

Index: include/utils/SkDumpCanvas.h
diff --git a/include/utils/SkDumpCanvas.h b/include/utils/SkDumpCanvas.h
index baf509fb19b000feaf22c48480b1760368f4c853..e111853369734b239feec3a25a7aa36fc3e1fda4 100644
--- a/include/utils/SkDumpCanvas.h
+++ b/include/utils/SkDumpCanvas.h
@@ -117,10 +117,10 @@ protected:
                         const uint16_t indices[], int indexCount,
                         const SkPaint&) 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 onDrawPicture(const SkPicture*, const SkMatrix*, const SkPaint*) override;
     void onDrawAnnotation(const SkRect&, const char key[], SkData* value) override;