Don't depend on V8 when creating the SDK.

dart/dart.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.
 
 {
   'targets': [
     {
       'target_name': 'compiler',
       'type': 'none',
       'dependencies': [
@@ skipping 12 matching lines @@
         'runtime/dart-runtime.gyp:test_extension',
       ],
     },
     {
       # Build the SDK. This target is separate from upload_sdk as the
       # editor needs to build the SDK without uploading it.
       'target_name': 'create_sdk',
       'type': 'none',
       'dependencies': [
         'runtime/dart-runtime.gyp:dart',
-        'dart2js',
+        'utils/compiler/compiler.gyp:dart2js',
       ],
       'actions': [
         {
           'action_name': 'create_sdk_py',
           'inputs': [
             '<!@(["python", "tools/list_files.py", "\\.dart$", "lib"])',
             '<!@(["python", "tools/list_files.py", "import_.*\\.config$", "lib/config"])',
             'tools/create_sdk.py',
             '<(PRODUCT_DIR)/<(EXECUTABLE_PREFIX)dart<(EXECUTABLE_SUFFIX)',
             '<(PRODUCT_DIR)/dart2js',
@@ skipping 48 matching lines @@
             'tools/upload_sdk.py',
             '<(PRODUCT_DIR)/dart-sdk'
           ],
         },
       ],
     },
     {
       'target_name': 'dart2js',
       'type': 'none',
       'dependencies': [
+        'third_party/v8/src/d8.gyp:d8',
         'utils/compiler/compiler.gyp:dart2js',
       ],
     },
     {
+      'target_name': 'dart2js_bot',
+      'type': 'none',
+      'dependencies': [
+        'third_party/v8/src/d8.gyp:d8',
+        'create_sdk',
+      ],
+    },
+    {
       'target_name': 'api_docs',
       'type': 'none',
       'dependencies': [
         'utils/apidoc/apidoc.gyp:api_docs',
       ],
     },
     {
       'target_name': 'samples',
       'type': 'none',
       'dependencies': [
         'samples/sample_extension/sample_extension.gyp:sample_extension',
       ],
     },
   ],
 }