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

include/utils/SkDumpCanvas.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkDumpCanvas_DEFINED
 #define SkDumpCanvas_DEFINED
 
@@ skipping 99 matching lines @@
     void onDrawImageRect(const SkImage*, const SkRect* src, const SkRect& dst,
                          const SkPaint*, SrcRectConstraint) override;
     void onDrawBitmapNine(const SkBitmap&, const SkIRect& center, const SkRect& dst,
                           const SkPaint*) override;
     void onDrawVertices(VertexMode vmode, int vertexCount,
                         const SkPoint vertices[], const SkPoint texs[],
                         const SkColor colors[], SkXfermode* xmode,
                         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;
 
     static const char* EdgeStyleToAAString(ClipEdgeStyle edgeStyle);
 
 private:
     Dumper* fDumper;
     int     fNestLevel; // for nesting recursive elements like pictures
 
@@ skipping 25 matching lines @@
  */
 class SkDebugfDumper : public SkFormatDumper {
 public:
     SkDebugfDumper();
 
 private:
     typedef SkFormatDumper INHERITED;
 };
 
 #endif