Add getClipStack method to lua SkCanvas

include/utils/SkLua.h

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkLua_DEFINED
 #define SkLua_DEFINED
 
 #include "SkColor.h"
 #include "SkScalar.h"
 #include "SkString.h"
 
 struct lua_State;
 
 class SkCanvas;
+class SkClipStack;
 class SkMatrix;
 class SkPaint;
 class SkPath;
 struct SkRect;
 class SkRRect;
 
 #define SkScalarToLua(x)    SkScalarToDouble(x)
 #define SkLuaToScalar(x)    SkDoubleToScalar(x)
 
 class SkLua {
@@ skipping 18 matching lines @@
     void pushArrayU16(const uint16_t[], int count, const char tableKey[] = NULL);
     void pushColor(SkColor, const char tableKey[] = NULL);
     void pushU32(uint32_t, const char tableKey[] = NULL);
     void pushScalar(SkScalar, const char tableKey[] = NULL);
     void pushRect(const SkRect&, const char tableKey[] = NULL);
     void pushRRect(const SkRRect&, const char tableKey[] = NULL);
     void pushMatrix(const SkMatrix&, const char tableKey[] = NULL);
     void pushPaint(const SkPaint&, const char tableKey[] = NULL);
     void pushPath(const SkPath&, const char tableKey[] = NULL);
     void pushCanvas(SkCanvas*, const char tableKey[] = NULL);
+    void pushClipStack(const SkClipStack&, const char tableKey[] = NULL);
 
 private:
     lua_State*  fL;
     SkString    fTermCode;
     bool        fWeOwnL;
 };
 
 #endif