Change option --use_script_snapshot to --use-script-snapshot (easier to type).

utils/compiler/compiler.gyp

 # 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.
 
 {
   'variables': {
     'dart_dir': '../..',
   },
   'targets': [
     {
       'target_name': 'dart2js',
       'type': 'none',
       'dependencies': [
         '../../runtime/dart-runtime.gyp:dart',
       ],
       'actions': [
         {
           'action_name': 'generate_dart2js_snapshot',
           'inputs': [
-            '<(PRODUCT_DIR)/<(EXECUTABLE_PREFIX)gen_snapshot<(EXECUTABLE_SUFFIX)',
             '<(PRODUCT_DIR)/<(EXECUTABLE_PREFIX)dart<(EXECUTABLE_SUFFIX)',
             '../../sdk/lib/_internal/libraries.dart',
             '<!@(["python", "../../tools/list_files.py", "\\.dart$", "../../sdk/lib/_internal/compiler", "../../runtime/lib"])',
           ],
           'outputs': [
             '<(PRODUCT_DIR)/dart2js.snapshot',
           ],
           'action': [
-            '<(PRODUCT_DIR)/<(EXECUTABLE_PREFIX)gen_snapshot<(EXECUTABLE_SUFFIX)',
+            '<(PRODUCT_DIR)/<(EXECUTABLE_PREFIX)dart<(EXECUTABLE_SUFFIX)',
             # Note: we don't store the snapshot in the location where
             # the dart2js script is looking for it.  The motivation
             # for that is to support an incremental development model
             # for dart2js compiler engineers.  However, we install the
             # snapshot in the proper location when building the SDK.
-            '--script_snapshot=<(PRODUCT_DIR)/dart2js.snapshot',
+            '--generate-script-snapshot=<(PRODUCT_DIR)/dart2js.snapshot',
             '../../sdk/lib/_internal/compiler/implementation/dart2js.dart',
           ],
         },
         {
           # TODO(ahe): Remove this action after a few days.
           'action_name': 'remove_old_scripts',
           'inputs': [
             'remove_old_scripts.py',
           ],
           'outputs': [
             '<(INTERMEDIATE_DIR)/<(_action_name).success',
           ],
           'action': [
             'python',
             '<@(_inputs)',
             '<@(_outputs)',
             '<(PRODUCT_DIR)/dart2js',
             '<(PRODUCT_DIR)/dart2js.bat',
             '<(PRODUCT_DIR)/dart2js_developer',
             '<(PRODUCT_DIR)/dart2js_developer.bat',
             '<(PRODUCT_DIR)/dartdoc',
             '<(PRODUCT_DIR)/dartdoc.bat',
           ]
         },
       ],
     },
   ],
 }