change default build (in "make" wrapper) to ninja on all platforms

gyp_skia

 #!/usr/bin/python
 
 # Copyright 2011 The Android Open Source Project
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # This script is a wrapper which invokes gyp with the correct --depth argument,
 # and supports the automatic regeneration of build files if all.gyp is
 # changed (Linux-only).
@@ skipping 66 matching lines @@
     return os.path.join(os.path.abspath(script_dir), output_dir)
 
 
 if __name__ == '__main__':
   args = sys.argv[1:]
 
   if not os.getenv(ENVVAR_GYP_GENERATORS):
     print ('%s environment variable not set, using default' %
            ENVVAR_GYP_GENERATORS)
     if sys.platform.startswith('darwin'):
-      default_gyp_generators = 'xcode'
+      default_gyp_generators = 'ninja,xcode'
     elif sys.platform.startswith('win'):
-      default_gyp_generators = 'msvs'
+      default_gyp_generators = 'ninja,msvs'
     elif sys.platform.startswith('cygwin'):
-      default_gyp_generators = 'msvs'
+      default_gyp_generators = 'ninja,msvs'
     else:
-      default_gyp_generators = 'make'
+      default_gyp_generators = 'ninja'
     os.environ[ENVVAR_GYP_GENERATORS] = default_gyp_generators
   print '%s is "%s"' % (ENVVAR_GYP_GENERATORS, os.getenv(ENVVAR_GYP_GENERATORS))
 
   # Set CWD to the directory containing this script.
   # This allows us to launch it from other directories, in spite of gyp's
   # finickyness about the current working directory.
   # See http://b.corp.google.com/issue?id=5019517 ('Linux make build
   # (from out dir) no longer runs skia_gyp correctly')
   os.chdir(os.path.abspath(script_dir))
 
@@ skipping 22 matching lines @@
   args.extend(['-Goutput_dir=.'])
 
   # By default, we build 'most' instead of 'all' or 'everything'. See skia.gyp.
   args.extend(['-Gdefault_target=most'])
 
   print 'Updating projects from gyp files...'
   sys.stdout.flush()
 
   # Off we go...
   sys.exit(gyp.main(args))