Support while loop in analyzer2dart.

pkg/analyzer2dart/test/end2end_data.dart

 // Copyright (c) 2014, 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.
 
 /// Test data for the end2end test.
 library test.end2end.data;
 
 import 'test_helper.dart' show Group;
 import 'test_helper.dart' as base show TestSpec;
 
@@ skipping 510 matching lines @@
   for (;;) {}
 }
 ''', '''
 main() {
   while (true) {}
 }
 '''),
 
 const TestSpec('''
 main() {
-  for (int i = 0; i < 10; i = i + 1) {
+  for (var i = 0; i < 10; i = i + 1) {
     print(i);
   }
 }
 ''', '''
 main() {
   var i = 0;
   while (i < 10) {
     print(i);
     ++i;
   }
 }
 '''),
 
 const TestSpec('''
 main(i) {
   for (i = 0; i < 10; i = i + 1) {
     print(i);
   }
 }
 ''', '''
 main(i) {
   i = 0;
   while (i < 10) {
     print(i);
     ++i;
   }
 }
 '''),
   ]),
+
+  const Group('While loop', const <TestSpec>[
+    const TestSpec('''
+main() {
+  while (true) {}
+}
+'''),
+
+const TestSpec('''
+main() {
+  var i = 0;
+  while (i < 10) {
+    print(i);
+    i = i + 1;
+  }
+}''', '''
+main() {
+  var i = 0;
+  while (i < 10) {
+    print(i);
+    ++i;
+  }
+}'''),
+  ]),
 ];