Checking in vendor folder for ease of using go get.

vendor/git.apache.org/thrift.git/lib/dart/tool/dev.dart

@@ -0,0 +1,33 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements. See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership. The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License. You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied. See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+library tool.dev;
+
+import 'package:dart_dev/dart_dev.dart' show dev, config;
+
+main(List<String> args) async {
+  // https://github.com/Workiva/dart_dev
+
+  var directories = ['lib/', 'test/', 'tool/'];
+  config.analyze.entryPoints = directories;
+  config.format.directories = directories;
+  config.copyLicense
+    ..licensePath = 'LICENSE_HEADER'
+    ..directories = directories;
+
+  await dev(args);
+}