enable shared lib support in linux for lua

gyp/tools.gyp

 # GYP file to build various tools.
 #
 # To build on Linux:
 #  ./gyp_skia tools.gyp && make tools
 #
 {
   'includes': [
     'apptype_console.gypi',
   ],
   'targets': [
     {
       # Build all executable targets defined below.
       'target_name': 'tools',
       'type': 'none',
       'dependencies': [
         'bench_pictures',
         'filter',
         'lua_pictures',
         'lua_app',
         'pinspect',
         'render_pdfs',
         'render_pictures',
         'skdiff',
         'skhello',
         'skimage',
       ],
+      'conditions': [
+        ['skia_shared_lib',
+          {
+            'dependencies': [
+              'sklua', # This can only be built if skia is built as a shared library
+            ],
+          },
+        ],
+      ],
     },
     {
       'target_name': 'skdiff',
       'type': 'executable',
       'sources': [
         '../tools/skdiff.cpp',
         '../tools/skdiff.h',
         '../tools/skdiff_html.cpp',
         '../tools/skdiff_html.h',
         '../tools/skdiff_main.cpp',
@@ skipping 53 matching lines @@
         '../src/utils/',
       ],
       'dependencies': [
         'skia_lib.gyp:skia_lib',
         'flags.gyp:flags',
         'gm.gyp:gm_expectations',
         'jsoncpp.gyp:jsoncpp',
         'utils.gyp:utils',
       ],
     },
+
     {
       'target_name': 'lua_app',
       'type': 'executable',
       'sources': [
         '../tools/lua/lua_app.cpp',
         '../src/utils/SkLua.cpp',
       ],
       'dependencies': [
         'skia_lib.gyp:skia_lib',
         'effects.gyp:effects',
@@ skipping 195 matching lines @@
         '../src/utils/debugger/SkObjectParser.h',
         '../src/utils/debugger/SkObjectParser.cpp',
       ],
       'dependencies': [
         'skia_lib.gyp:skia_lib',
         'tools.gyp:picture_utils',
       ],
     },
   ],
   'conditions': [
+    ['skia_shared_lib',
+      {
+        'targets': [
+          {
+            'target_name': 'sklua',
+            'product_name': 'skia',
+            'product_prefix': '',
+            'product_dir': '<(PRODUCT_DIR)/',
+            'type': 'shared_library',
+            'sources': [
+              '../src/utils/SkLuaCanvas.cpp',
+              '../src/utils/SkLua.cpp',
+            ],
+            'include_dirs': [
+              '../third_party/lua/src/',
+            ],
+            'dependencies': [
+              'lua.gyp:lua',
+              'pdf.gyp:pdf',
+              'skia_lib.gyp:skia_lib',
+            ],
+            'conditions': [
+              ['skia_os != "win"',
+                {
+                  'ldflags': [
+                    '-Wl,-rpath,\$$ORIGIN,--enable-new-dtags',
+                  ],
+                },
+              ],
+            ],
+          },
+        ],
+      },
+    ],
     ['skia_win_debuggers_path and skia_os == "win"',
       {
         'targets': [
           {
             'target_name': 'win_dbghelp',
             'type': 'static_library',
             'defines': [
               'SK_CDB_PATH="<(skia_win_debuggers_path)"',
             ],
             'sources': [
@@ skipping 18 matching lines @@
       },
     ],
   ],
 }
 
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