Switch polymer's build.dart to use the new linter. This CL does the following

pkg/polymer/lib/component_build.dart

 // 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.
 
-/**
- * Common logic to make it easy to create a `build.dart` for your project.
- *
- * The `build.dart` script is invoked automatically by the Editor whenever a
- * file in the project changes. It must be placed in the root of a project
- * (where pubspec.yaml lives) and should be named exactly 'build.dart'.
- *
- * A common `build.dart` would look as follows:
- *
- *     import 'dart:io';
- *     import 'package:polymer/component_build.dart';
- *
- *     main() => build(new Options().arguments, ['web/index.html']);
- */
+/** This library is deprecated. Please use `build_helper.dart` instead. */
+@deprecated
 library build_utils;
 
-import 'dart:async';
-import 'dart:convert';
-import 'dart:io';
-import 'package:args/args.dart';
+import 'package:meta/meta.dart';
 
-import 'dwc.dart' as dwc;
-import 'src/utils.dart';
-import 'src/compiler_options.dart';
+import 'build_helper.dart';
 
 /**
- * Set up 'build.dart' to compile with the dart web components compiler every
- * [entryPoints] listed. On clean commands, the directory where [entryPoints]
- * live will be scanned for generated files to delete them.
+ * This function is deprecated. Please use `lint` from `build_helper.dart`
+ * instead.
  */
-Future<List<dwc.AnalysisResults>> build(List<String> arguments,
-    List<String> entryPoints,
+@deprecated
+Future build(List<String> arguments, List<String> entryPoints,
     {bool printTime: true, bool shouldPrint: true}) {
-  bool useColors = stdioType(stdout) == StdioType.TERMINAL;
-  return asyncTime('Total time', () {
-    var args = _processArgs(arguments);
-    var tasks = new FutureGroup();
-    var lastTask = new Future.value(null);
-    tasks.add(lastTask);
-
-    var changedFiles = args["changed"];
-    var removedFiles = args["removed"];
-    var cleanBuild = args["clean"];
-    var machineFormat = args["machine"];
-    // Also trigger a full build if the script was run from the command line
-    // with no arguments
-    var fullBuild = args["full"] || (!machineFormat && changedFiles.isEmpty &&
-        removedFiles.isEmpty && !cleanBuild);
-
-    var options = CompilerOptions.parse(args.rest, checkUsage: false);
-
-    if (fullBuild || !changedFiles.isEmpty || !removedFiles.isEmpty) {
-      for (var file in entryPoints) {
-        var dwcArgs = new List.from(args.rest);
-        if (machineFormat) dwcArgs.add('--json_format');
-        if (!useColors) dwcArgs.add('--no-colors');
-        dwcArgs.add(file);
-        // Chain tasks to that we run one at a time.
-        lastTask = lastTask.then((_) => dwc.run(dwcArgs, printTime: printTime,
-            shouldPrint: shouldPrint));
-        if (machineFormat) {
-          lastTask = lastTask.then((res) {
-            appendMessage(Map jsonMessage) {
-              var message = JSON.encode([jsonMessage]);
-              if (shouldPrint) print(message);
-              res.messages.add(message);
-            }
-            return res;
-          });
-        }
-        tasks.add(lastTask);
-      }
-    }
-    return tasks.future.then((r) => r.where((v) => v != null));
-  }, printTime: printTime, useColors: useColors);
+  return lint(entrypoints: entryPoints, options: parseOptions(arguments));
 }
-
-/** Process the command-line arguments. */
-ArgResults _processArgs(List<String> arguments) {
-  var parser = new ArgParser()
-    ..addOption("changed", help: "the file has changed since the last build",
-        allowMultiple: true)
-    ..addOption("removed", help: "the file was removed since the last build",
-        allowMultiple: true)
-    ..addFlag("clean", negatable: false, help: "currently a noop, may be used "
-        "in the future to remove any build artifacts")
-    ..addFlag("full", negatable: false, help: "perform a full build")
-    ..addFlag("machine", negatable: false,
-        help: "produce warnings in a machine parseable format")
-    ..addFlag("help", abbr: 'h',
-        negatable: false, help: "displays this help and exit");
-  var args = parser.parse(arguments);
-  if (args["help"]) {
-    print('A build script that invokes the web-ui compiler (dwc).');
-    print('Usage: dart build.dart [options] [-- [dwc-options]]');
-    print('\nThese are valid options expected by build.dart:');
-    print(parser.getUsage());
-    print('\nThese are valid options expected by dwc:');
-    dwc.run(['-h']).then((_) => exit(0));
-  }
-  return args;
-}