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

src/utils/SkLua.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 "SkLua.h"
 
 #if SK_SUPPORT_GPU
@@ skipping 387 matching lines @@
         case SkClipStack::Element::kRect_Type:
             this->pushRect(element.getRect(), "rect");
             break;
         case SkClipStack::Element::kRRect_Type:
             this->pushRRect(element.getRRect(), "rrect");
             break;
         case SkClipStack::Element::kPath_Type:
             this->pushPath(element.getPath(), "path");
             break;
     }
-    this->pushString(region_op(element.getOp()), "op");
+    this->pushString(region_op((SkRegion::Op)element.getOp()), "op");
     this->pushBool(element.isAA(), "aa");
     CHECK_SETFIELD(key);
 }
 
 
 ///////////////////////////////////////////////////////////////////////////////
 ///////////////////////////////////////////////////////////////////////////////
 
 static SkScalar getfield_scalar(lua_State* L, int index, const char key[]) {
     SkASSERT(lua_istable(L, index));
@@ skipping 1761 matching lines @@
     REG_CLASS(L, SkTextBlob);
     REG_CLASS(L, SkTypeface);
     REG_CLASS(L, SkXfermode);
 }
 
 extern "C" int luaopen_skia(lua_State* L);
 extern "C" int luaopen_skia(lua_State* L) {
     SkLua::Load(L);
     return 0;
 }