Migrate DDC to the new analysis driver.

pkg/dev_compiler/lib/src/compiler/command.dart

Index: pkg/dev_compiler/lib/src/compiler/command.dart
diff --git a/pkg/dev_compiler/lib/src/compiler/command.dart b/pkg/dev_compiler/lib/src/compiler/command.dart
index af34e95f711c3490304d9cd70cff1f4cfdcaa5f6..b778c5b532574089144ed5bafab346ecb30fe854 100644
--- a/pkg/dev_compiler/lib/src/compiler/command.dart
+++ b/pkg/dev_compiler/lib/src/compiler/command.dart
@@ -2,6 +2,7 @@
 // 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.
 
+import 'dart:async';
 import 'dart:io';
 import 'package:analyzer/src/command_line/arguments.dart'
     show
@@ -13,10 +14,10 @@ import 'package:analyzer/src/summary/package_bundle_reader.dart'
     show ConflictingSummaryException, InSummarySource;
 import 'package:args/args.dart' show ArgParser, ArgResults;
 import 'package:args/command_runner.dart' show UsageException;
+import 'package:dev_compiler/src/compiler/compiler.dart';
 import 'package:path/path.dart' as path;
 
 import '../analyzer/context.dart' show AnalyzerOptions;
-import 'compiler.dart' show BuildUnit, CompilerOptions, ModuleCompiler;
 import 'module_builder.dart';
 
 const _binaryName = 'dartdevc';
@@ -28,7 +29,7 @@ bool _verbose = false;
 /// This handles argument parsing, usage, error handling.
 /// See bin/dartdevc.dart for the actual entry point, which includes Bazel
 /// worker support.
-int compile(List<String> args, {void printFn(Object obj)}) {
+Future<int> compile(List<String> args, {void printFn(Object obj)}) async {
   printFn ??= print;
 
   ArgResults argResults;
@@ -57,7 +58,7 @@ int compile(List<String> args, {void printFn(Object obj)}) {
   }
 
   try {
-    _compile(argResults, analyzerOptions, printFn);
+    await _compile(argResults, analyzerOptions, printFn);
     return 0;
   } on UsageException catch (error) {
     // Incorrect usage, input file not found, etc.
@@ -131,8 +132,8 @@ bool _changed(List<int> list1, List<int> list2) {
   return false;
 }
 
-void _compile(ArgResults argResults, AnalyzerOptions analyzerOptions,
-    void printFn(Object obj)) {
+Future<Null> _compile(ArgResults argResults, AnalyzerOptions analyzerOptions,
+    void printFn(Object obj)) async {
   var compiler = new ModuleCompiler(analyzerOptions);
   var compilerOpts = new CompilerOptions.fromArguments(argResults);
   var outPaths = argResults['out'] as List<String>;
@@ -183,7 +184,7 @@ void _compile(ArgResults argResults, AnalyzerOptions analyzerOptions,
   var unit = new BuildUnit(modulePath, libraryRoot, argResults.rest,
       (source) => _moduleForLibrary(moduleRoot, source, compilerOpts));
 
-  var module = compiler.compile(unit, compilerOpts);
+  JSModuleFile module = await compiler.compile(unit, compilerOpts);
   module.errors.forEach(printFn);
 
   if (!module.isValid) {