Stop running pub get at gclient sync time and fix build bugs

mojo/public/dart/third_party/shelf_static/example/example_server.dart

+// Copyright (c) 2015, 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.
+
+library shelf_static.example;
+
+import 'dart:io';
+import 'package:args/args.dart';
+import 'package:shelf/shelf.dart' as shelf;
+import 'package:shelf/shelf_io.dart' as io;
+import 'package:shelf_static/shelf_static.dart';
+
+void main(List<String> args) {
+  var parser = _getParser();
+
+  int port;
+  bool logging;
+  bool listDirectories;
+
+  try {
+    var result = parser.parse(args);
+    port = int.parse(result['port']);
+    logging = result['logging'];
+    listDirectories = result['list-directories'];
+  } on FormatException catch (e) {
+    stderr.writeln(e.message);
+    stderr.writeln(parser.usage);
+    // http://linux.die.net/include/sysexits.h
+    // #define EX_USAGE 64      /* command line usage error */
+    exit(64);
+  }
+
+  if (!FileSystemEntity.isFileSync('example/example_server.dart')) {
+    throw new StateError('Server expects to be started the '
+        'root of the project.');
+  }
+  var pipeline = const shelf.Pipeline();
+
+  if (logging) {
+    pipeline = pipeline.addMiddleware(shelf.logRequests());
+  }
+
+  var defaultDoc = _defaultDoc;
+  if (listDirectories) {
+    defaultDoc = null;
+  }
+
+  var handler = pipeline.addHandler(createStaticHandler('example/files',
+      defaultDocument: defaultDoc, listDirectories: listDirectories));
+
+  io.serve(handler, 'localhost', port).then((server) {
+    print('Serving at http://${server.address.host}:${server.port}');
+  });
+}
+
+ArgParser _getParser() => new ArgParser()
+  ..addFlag('logging', abbr: 'l', defaultsTo: true, negatable: true)
+  ..addOption('port', abbr: 'p', defaultsTo: '8080')
+  ..addFlag('list-directories',
+      abbr: 'f',
+      defaultsTo: false,
+      negatable: false,
+      help: 'List the files in the source directory instead of servering the default document - "$_defaultDoc".');
+
+const _defaultDoc = 'index.html';