Add missing sk_tool_utils flags_common dependency

gyp/tools.gyp

 # Copyright 2015 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
     # GYP file to build various tools.
 #
 # To build on Linux:
 #  ./gyp_skia tools.gyp && make tools
 #
 {
@@ skipping 164 matching lines @@
         '../tools/random_parse_path.cpp',
       ],
       'include_dirs': [
         '../include/private',
         '../src/fonts',
         '../src/core',
       ],
       'dependencies': [
         'resources',
         'flags.gyp:flags',
+        'flags.gyp:flags_common',
         'skia_lib.gyp:skia_lib',
       ],
       'direct_dependent_settings': {
         'include_dirs': [ '../tools', ],
       },
     },
     {
       'target_name' : 'timer',
       'type': 'static_library',
       'sources': [ '../tools/timer/Timer.cpp' ],
@@ skipping 504 matching lines @@
               'pdf.gyp:pdf',
               'gputest.gyp:osmesa',
             ],
             'defines': [ 'FIDDLE_BUILD_TEST' ],
           },
         ],
       },
     ],
   ],
 }