Support parameter access in analyzer2dart.

pkg/analyzer2dart/test/end2end_test.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.
 
 /// End-to-end test of the analyzer2dart compiler.
 
 import 'dart:async';
 
 import 'mock_sdk.dart';
 import 'package:analyzer/file_system/memory_file_system.dart';
@@ skipping 220 matching lines @@
 foo(a) $NEW_BACKEND_COMMENT
   {}
 
 main() $NEW_BACKEND_COMMENT
   {
     foo(null);
     bar(0, "");
   }
 
 ''');
+
+    checkResult('''
+bar(b) {}
+foo(a) {
+  bar(a);
+}
+main() {
+  foo(null);
+}
+''', '''
+bar(b) $NEW_BACKEND_COMMENT
+  {}
+
+foo(a) $NEW_BACKEND_COMMENT
+  {
+    bar(a);
+  }
+
+main() $NEW_BACKEND_COMMENT
+  {
+    foo(null);
+  }
+
+''');
   });
 }
 
 checkResult(String input, String expectedOutput) {
   CollectingOutputProvider outputProvider = new CollectingOutputProvider();
   MemoryResourceProvider provider = new MemoryResourceProvider();
   DartSdk sdk = new MockSdk();
   Driver driver = new Driver(provider, sdk, outputProvider);
   String rootFile = '/root.dart';
   provider.newFile(rootFile, input);
@@ skipping 21 matching lines @@
     sb.write(text);
   }
 
   void addError(errorEvent, [StackTrace stackTrace]) {}
 
   void close() {}
 
   String get text => sb.toString();
 }