expand SkLua to handle creation of its own State

src/utils/SkLuaCanvas.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 "SkLuaCanvas.h"
 #include "SkLua.h"
 
 extern "C" {
     #include "lua.h"
     #include "lauxlib.h"
 }
 
 class AutoCallLua : public SkLua {
 public:
     AutoCallLua(lua_State* L, const char func[], const char verb[]) : INHERITED(L) {
         lua_getglobal(L, func);
         if (!lua_isfunction(L, -1)) {
             int t = lua_type(L, -1);
             SkDebugf("--- expected function %d\n", t);
         }
 
         lua_newtable(L);
         this->pushString(verb, "verb");
     }
 
     ~AutoCallLua() {
-        lua_State* L = this->getL();
+        lua_State* L = this->get();
         if (lua_pcall(L, 1, 0, 0) != LUA_OK) {
             SkDebugf("lua err: %s\n", lua_tostring(L, -1));
         }
         lua_settop(L, -1);
     }
 
 private:
     typedef SkLua INHERITED;
 };
 
@@ skipping 210 matching lines @@
                                  const SkColor colors[], SkXfermode* xmode,
                                  const uint16_t indices[], int indexCount,
                                  const SkPaint& paint) {
     AUTO_LUA("drawVertices");
     lua.pushPaint(paint, "paint");
 }
 
 void SkLuaCanvas::drawData(const void* data, size_t length) {
     AUTO_LUA("drawData");
 }