Support constructor invocation in analyzer2dart.

pkg/analyzer2dart/lib/src/element_converter.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.
 
 /// Convertion of elements between the analyzer element model and the dart2js
 /// element model.
 
 library analyzer2dart.element_converter;
 
 import 'package:compiler/implementation/elements/elements.dart' as dart2js;
@@ skipping 135 matching lines @@
       return input.variable.accept(this);
     }
     return null;
   }
 
   @override
   dart2js.Element visitLocalVariableElement(
       analyzer.LocalVariableElement input) {
     return new LocalVariableElementY(converter, input);
   }
+
+  @override
+  dart2js.ConstructorElement visitConstructorElement(
+      analyzer.ConstructorElement input) {
+    return new ConstructorElementY(converter, input);
+  }
 }