use ForceLinking to get codecs into lua_picture

tools/lua/lua_pictures.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"
 #include "SkLuaCanvas.h"
 #include "SkPicture.h"
 #include "SkCommandLineFlags.h"
 #include "SkGraphics.h"
 #include "SkStream.h"
 #include "SkData.h"
 #include "picture_utils.h"
 #include "SkOSFile.h"
 #include "SkImageDecoder.h"
+#include "SkForceLinking.h"
+
+__SK_FORCE_IMAGE_DECODER_LINKING;
 
 extern "C" {
     #include "lua.h"
     #include "lualib.h"
     #include "lauxlib.h"
 }
 
 static const char gStartCanvasFunc[] = "sk_scrape_startcanvas";
 static const char gEndCanvasFunc[] = "sk_scrape_endcanvas";
 static const char gAccumulateFunc[] = "sk_scrape_accumulate";
@@ skipping 112 matching lines @@
         }
     }
     return 0;
 }
 
 #if !defined SK_BUILD_FOR_IOS
 int main(int argc, char * const argv[]) {
     return tool_main(argc, (char**) argv);
 }
 #endif