Add name/offset constructors for default parameter elements.

pkg/analyzer/lib/src/generated/testing/element_factory.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.
 
 library analyzer.src.generated.testing.element_factory;
 
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/element/element.dart';
@@ skipping 216 matching lines @@
       ];
       setter.returnType = VoidTypeImpl.instance;
       setter.type = new FunctionTypeImpl(setter);
       field.setter = setter;
     }
     return field;
   }
 
   static FieldFormalParameterElementImpl fieldFormalParameter(
           Identifier name) =>
-      new FieldFormalParameterElementImpl(name);
+      new FieldFormalParameterElementImpl.forNode(name);
 
   static FunctionElementImpl functionElement(String functionName) =>
       functionElement4(functionName, null, null, null, null);
 
   static FunctionElementImpl functionElement2(
           String functionName, TypeDefiningElement returnElement) =>
       functionElement3(functionName, returnElement, null, null);
 
   static FunctionElementImpl functionElement3(
       String functionName,
@@ skipping 377 matching lines @@
   }
 
   static TypeParameterElementImpl typeParameterWithType(String name,
       [DartType bound]) {
     TypeParameterElementImpl typeParameter = typeParameterElement(name);
     typeParameter.type = new TypeParameterTypeImpl(typeParameter);
     typeParameter.bound = bound;
     return typeParameter;
   }
 }