Enable turning on analyzer build in sdk for macs.

tools/create_sdk.py

 #!/usr/bin/env python
 #
 # 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.
 #
 # A script which will be invoked from gyp to create an SDK.
 #
 # Usage: create_sdk.py sdk_directory
 #
@@ skipping 80 matching lines @@
     dest.close()
 
 
 def Copy(src, dest):
   copyfile(src, dest)
   copymode(src, dest)
 
 # TODO(zundel): this excludes the analyzer from the sdk build until builders
 # have all prerequisite software installed.  Also update dart.gyp.
 def ShouldCopyAnalyzer():
-  return utils.GuessOS() == 'linux'
+  os = utils.GuessOS(); 
+  return os == 'linux' or os == 'macos'
 
 
 def CopyShellScript(src_file, dest_dir):
   '''Copies a shell/batch script to the given destination directory. Handles
      using the appropriate platform-specific file extension.'''
   file_extension = ''
   if utils.GuessOS() == 'win32':
     file_extension = '.bat'
 
   src = src_file + file_extension
@@ skipping 358 matching lines @@
   if revision is not None:
     with open(os.path.join(SDK_tmp, 'revision'), 'w') as f:
       f.write(revision + '\n')
       f.close()
 
   move(SDK_tmp, SDK)
   utils.Touch(os.path.join(SDK, 'create.stamp'))
 
 if __name__ == '__main__':
   sys.exit(Main(sys.argv))