expand SkLua to handle creation of its own State

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 SkMatrix;
 class SkPaint;
 class SkPath;
 struct SkRect;
 class SkRRect;
-class SkString;
 
 #define SkScalarToLua(x)    SkScalarToDouble(x)
 #define SkLuaToScalar(x)    SkDoubleToScalar(x)
 
 class SkLua {
 public:
     static void Load(lua_State*);
 
-    SkLua(lua_State*);
+    SkLua(const char termCode[] = NULL);    // creates a new L, will close it
+    SkLua(lua_State*);                      // uses L, will not close it
     ~SkLua();
 
-    lua_State* getL() const { return fL; }
-
+    lua_State* get() const { return fL; }
+    lua_State* operator*() const { return fL; }
+    lua_State* operator->() const { return fL; }
+    
+    bool runCode(const char code[]);
+    bool runCode(const void* code, size_t size);
+    
     void pushBool(bool, const char tableKey[] = NULL);
     void pushString(const char[], const char tableKey[] = NULL);
     void pushString(const SkString&, const char tableKey[] = NULL);
     void pushColor(SkColor, 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);
 
 private:
-    lua_State* fL;
+    lua_State*  fL;
+    SkString    fTermCode;
+    bool        fWeOwnL;
 };
 
 #endif