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

src/utils/SkCanvasStateUtils.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkCanvasStateUtils.h"
 
 #include "SkCanvas.h"
@@ skipping 266 matching lines @@
     SkRegion clip;
     for (int i = 0; i < state.clipRectCount; ++i) {
         clip.op(SkIRect::MakeLTRB(state.clipRects[i].left,
                                   state.clipRects[i].top,
                                   state.clipRects[i].right,
                                   state.clipRects[i].bottom),
                 SkRegion::kUnion_Op);
     }
 
     canvas->setMatrix(matrix);
-    canvas->setClipRegion(clip);
+    canvas->clipRegion(clip, SkCanvas::kReplace_Op);
 }
 
 static SkCanvas* create_canvas_from_canvas_layer(const SkCanvasLayerState& layerState) {
     SkASSERT(kRaster_CanvasBackend == layerState.type);
 
     SkBitmap bitmap;
     SkColorType colorType =
         layerState.raster.config == kARGB_8888_RasterConfig ? kN32_SkColorType :
         layerState.raster.config == kRGB_565_RasterConfig ? kRGB_565_SkColorType :
         kUnknown_SkColorType;
@@ skipping 48 matching lines @@
 
 ////////////////////////////////////////////////////////////////////////////////
 
 void SkCanvasStateUtils::ReleaseCanvasState(SkCanvasState* state) {
     SkASSERT(!state || SkCanvasState_v1::kVersion == state->version);
     // Upcast to the correct version of SkCanvasState. This avoids having a virtual destructor on
     // SkCanvasState. That would be strange since SkCanvasState has no other virtual functions, and
     // instead uses the field "version" to determine how to behave.
     delete static_cast<SkCanvasState_v1*>(state);
 }