Fix build break caused by Skia changes.

samples/openglui/emulator/emulator.gyp

 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 # We should be able to make this work on Mac. We need:
 # -framework OpenGL -framework GLUT -lm -L /usr/X11/lib
 
 {
   'targets': [
     {
@@ skipping 64 matching lines @@
                  '-lskia_effects',
                  '-lskia_gr',
                  '-lskia_images',
                  '-lskia_opts',
                  '-lskia_opts_ssse3',
                  '-lskia_ports',
                  '-lskia_sfnt',
                  '-lskia_skgr',
                  '-lskia_utils',
                  '-Wl,--end-group',
+                 '-lfontconfig',
                  '-lfreetype',
                  '-lGL',
                  '-lglut',
                  '-lGLU',
                  '-lpng',
                  '-lm',
                  '-lc' ],
               'ldflags': [
                 '-Wall',
                 '-g',
@@ skipping 10 matching lines @@
                '-framework GLUT',
                '-L /usr/X11/lib'
              ],
            }
         ]
       ]
     }
   ]
 }