dart2js has its own snapshot.

dart/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 95 matching lines @@
   Copy(src, dest)
 
 
 def CopyDartScripts(home, sdk_root):
   for executable in ['dart2js', 'dartanalyzer', 'dartdoc', 'pub']:
     CopyShellScript(os.path.join(home, 'sdk', 'bin', executable),
                     os.path.join(sdk_root, 'bin'))
 
 
 def CopySnapshots(snapshots, sdk_root):
-  for snapshot in ['utils_wrapper', 'pub']:
+  for snapshot in ['dart2js', 'utils_wrapper', 'pub']:
     snapshot += '.dart.snapshot'
     copyfile(join(snapshots, snapshot),
              join(sdk_root, 'bin', 'snapshots', snapshot))
 
 
 def Main(argv):
   # Pull in all of the gypi files which will be munged into the sdk.
   HOME = dirname(dirname(realpath(__file__)))
 
   (options, args) = GetOptions()
@@ skipping 128 matching lines @@
     with open(os.path.join(SDK_tmp, 'revision'), 'w') as f:
       f.write(revision + '\n')
       f.close()
 
   Copy(join(HOME, 'README.dart-sdk'), join(SDK_tmp, 'README'))
 
   move(SDK_tmp, SDK)
 
 if __name__ == '__main__':
   sys.exit(Main(sys.argv))