Use MockSdk to speed-up tests.

pkg/analyzer2dart/bin/analyzer2dart.dart

Index: pkg/analyzer2dart/bin/analyzer2dart.dart
diff --git a/pkg/analyzer2dart/bin/analyzer2dart.dart b/pkg/analyzer2dart/bin/analyzer2dart.dart
index 3f618f81e48c9b7476398185c703d75e384658c7..b016a7893f0d7accb004ac46bf2c8ef053148f5f 100644
--- a/pkg/analyzer2dart/bin/analyzer2dart.dart
+++ b/pkg/analyzer2dart/bin/analyzer2dart.dart
@@ -7,6 +7,8 @@ library analyzer2dart.cmdline;
 
 import 'package:analyzer/analyzer.dart';
 import 'package:analyzer/src/generated/element.dart';
+import 'package:analyzer/src/generated/sdk.dart';
+import 'package:analyzer/src/generated/sdk_io.dart';
 import 'package:analyzer/src/generated/source_io.dart';
 
 import '../lib/src/closed_world.dart';
@@ -16,7 +18,8 @@ void main(List<String> args) {
   // TODO(paulberry): hacky
   String path = args[0];
 
-  Driver analyzer2Dart = new Driver();
+  DartSdk sdk = DirectoryBasedDartSdk.defaultSdk;
+  Driver analyzer2Dart = new Driver(sdk);
 
   // Tell the analysis server about the root
   Source source = analyzer2Dart.setRealRoot(path);