Fix for issue 11112 align flags to formats used by other tools.

utils/compiler/create_snapshot.dart

 // Copyright (c) 2013, 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.
 
 import 'dart:io';
 
 Future<String> getVersion(var options, var rootPath) {
   var os = Platform.operatingSystem;
   var suffix = os == 'windows' ? '.exe' : '';
   var checkedInBinary =
@@ skipping 40 matching lines @@
 void writeSnapshotFile(var path, var content) {
     File file = new File(path);
     var writer = file.openSync(mode: FileMode.WRITE);
     writer.writeStringSync(content);
     writer.close();
 }
 
 Future createSnapshot(var options, var dart_file, var packageRoot) {
   return Process.run(options.executable,
                      ["--package-root=$packageRoot",
-                      "--generate-script-snapshot=$dart_file.snapshot",
+                      "--snapshot=$dart_file.snapshot",
                       dart_file])
       .then((result) {
         if (result.exitCode != 0) {
           throw "Could not generate snapshot";
         }
       });
 }
 
 /**
  * Takes the following arguments:
@@ skipping 20 matching lines @@
 
   var scriptFile = new File(new File(options.script).fullPathSync());
   var path = new Path(scriptFile.directory.path);
   var rootPath = path.directoryPath.directoryPath;
   getSnapshotGenerationFile(options, args, rootPath).then((result) {
     var wrapper = "${args['output_dir']}/utils_wrapper.dart";
     writeSnapshotFile(wrapper, result);
     createSnapshot(options, wrapper, args["package_root"]);
   });
 }