First end-to-end capability in analyzer2dart.

pkg/analyzer2dart/test/tree_shaker_test.dart

Index: pkg/analyzer2dart/test/tree_shaker_test.dart
diff --git a/pkg/analyzer2dart/test/tree_shaker_test.dart b/pkg/analyzer2dart/test/tree_shaker_test.dart
index 756d3785a255c5f73351ab05cb5a4e3518cc400e..31064368b3861b62c6d782c5915c639910a70b44 100644
--- a/pkg/analyzer2dart/test/tree_shaker_test.dart
+++ b/pkg/analyzer2dart/test/tree_shaker_test.dart
@@ -8,6 +8,7 @@ import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/element.dart';
 import 'package:analyzer/src/generated/sdk.dart';
 import 'package:analyzer/src/generated/source.dart';
+import 'package:compiler/implementation/dart2jslib.dart' show NullSink;
 import 'package:unittest/unittest.dart';
 
 import '../lib/src/closed_world.dart';
@@ -176,7 +177,7 @@ class TreeShakerTestHelper {
   TreeShakerTestHelper(String contents) {
     MemoryResourceProvider provider = new MemoryResourceProvider();
     DartSdk sdk = new MockSdk();
-    Driver driver = new Driver(provider, sdk);
+    Driver driver = new Driver(provider, sdk, NullSink.outputProvider);
     provider.newFile(rootFile, contents);
     Source rootSource = driver.setRoot(rootFile);
     FunctionElement entryPoint = driver.resolveEntryPoint(rootSource);