Migrate DDC to the new analysis driver.

pkg/dev_compiler/bin/dartdevc.dart

 #!/usr/bin/env dart
 // Copyright (c) 2016, 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.
 
 /// Command line entry point for Dart Development Compiler (dartdevc).
 ///
 /// Supported commands are
 ///   * compile: builds a collection of dart libraries into a single JS module
 ///
@@ skipping 32 matching lines @@
 import 'package:bazel_worker/bazel_worker.dart';
 import 'package:dev_compiler/src/compiler/command.dart';
 
 Future main(List<String> args) async {
   // Always returns a new modifiable list.
   args = preprocessArgs(PhysicalResourceProvider.INSTANCE, args);
 
   if (args.contains('--persistent_worker')) {
     new _CompilerWorker(args..remove('--persistent_worker')).run();
   } else {
-    exitCode = compile(args);
+    exitCode = await compile(args);
   }
 }
 
 /// Runs the compiler worker loop.
 class _CompilerWorker extends AsyncWorkerLoop {
   /// The original args supplied to the executable.
   final List<String> _startupArgs;
 
   _CompilerWorker(this._startupArgs) : super();
 
   /// Performs each individual work request.
   Future<WorkResponse> performRequest(WorkRequest request) async {
     var args = _startupArgs.toList()..addAll(request.arguments);
 
     var output = new StringBuffer();
-    var exitCode = compile(args, printFn: output.writeln);
+    var exitCode = await compile(args, printFn: output.writeln);
     AnalysisEngine.instance.clearCaches();
     return new WorkResponse()
       ..exitCode = exitCode
       ..output = output.toString();
   }
 }