Migrate DDC to the new analysis driver.

pkg/dev_compiler/bin/dartdevc.dart

Index: pkg/dev_compiler/bin/dartdevc.dart
diff --git a/pkg/dev_compiler/bin/dartdevc.dart b/pkg/dev_compiler/bin/dartdevc.dart
index 4a0ccbe410fcfff622ed5501e292d2d7a0246e5c..d514816c9465daff03e2420a0ed147e51a0d561f 100755
--- a/pkg/dev_compiler/bin/dartdevc.dart
+++ b/pkg/dev_compiler/bin/dartdevc.dart
@@ -50,7 +50,7 @@ Future main(List<String> args) async {
   if (args.contains('--persistent_worker')) {
     new _CompilerWorker(args..remove('--persistent_worker')).run();
   } else {
-    exitCode = compile(args);
+    exitCode = await compile(args);
   }
 }
 
@@ -66,7 +66,7 @@ class _CompilerWorker extends AsyncWorkerLoop {
     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