Add GYP target for sk_tool_utils.* component.

gyp/bench.gyp

 # GYP file to build performance testbench.
 #
 {
   'includes': [
     'apptype_console.gypi',
   ],
   'targets': [
     {
       'target_name': 'bench',
       'type': 'executable',
       'dependencies': [
         'etc1.gyp:libetc1',
         'flags.gyp:flags',
         'jsoncpp.gyp:jsoncpp',
         'skia_lib.gyp:skia_lib',
         'tools.gyp:crash_handler',
         'tools.gyp:resources',
+        'tools.gyp:sk_tool_utils',
         'tools.gyp:timer',
       ],
       'sources': [
         '../bench/BenchLogger.cpp',
         '../bench/BenchLogger.h',
         '../bench/GMBench.cpp',
         '../bench/GMBench.h',
         '../bench/ResultsWriter.cpp',
         '../bench/benchmain.cpp',
-        '../tools/sk_tool_utils.cpp',
       ],
       'conditions': [
         ['skia_gpu == 1',
           {
             'include_dirs' : [
               '../src/gpu',
             ],
             'dependencies': [
               'gputest.gyp:skgputest',
             ],
           },
         ],
         ['skia_android_framework == 1',
           {
             'libraries': [
               '-lskia',
             ],
           },
         ],
       ],
       'includes': [
         'bench.gypi',
         'gmslides.gypi',
       ],
     },
   ],
 }