tool --help alphabetizes command line flags

gyp/flags.gyp

 # GYP file to build flag parser
 #
 {
   'targets': [
     {
       'target_name': 'flags',
       'type': 'static_library',
+      'include_dirs': [ '../src/core', ],
       'sources': [
         '../tools/flags/SkCommandLineFlags.cpp',
         '../tools/flags/SkCommandLineFlags.h',
       ],
       'dependencies': [
         'skia_lib.gyp:skia_lib',
       ],
       'direct_dependent_settings': {
         'include_dirs': [
           '../tools/flags',
@@ skipping 12 matching lines @@
         'flags.gyp:flags',
       ],
       'direct_dependent_settings': {
         'include_dirs': [
           '../tools/flags',
         ],
       }
     },
   ],
 }