Add summary support for ParameterElement.defaultValueCode.

pkg/analyzer/lib/src/generated/testing/element_factory.dart

Index: pkg/analyzer/lib/src/generated/testing/element_factory.dart
diff --git a/pkg/analyzer/lib/src/generated/testing/element_factory.dart b/pkg/analyzer/lib/src/generated/testing/element_factory.dart
index b94cb64c00ec73d0f4b2bbc7ab704b7bbdc59749..56228243a2b10925b6df2a111af69507ae9fcb46 100644
--- a/pkg/analyzer/lib/src/generated/testing/element_factory.dart
+++ b/pkg/analyzer/lib/src/generated/testing/element_factory.dart
@@ -501,12 +501,13 @@ class ElementFactory {
   }
 
   static ParameterElementImpl namedParameter3(String name,
-      {DartType type, Expression initializer}) {
+      {DartType type, Expression initializer, String initializerCode}) {
     DefaultParameterElementImpl parameter =
         new DefaultParameterElementImpl(name, 0);
     parameter.parameterKind = ParameterKind.NAMED;
     parameter.type = type;
     parameter.constantInitializer = initializer;
+    parameter.defaultValueCode = initializerCode;
     return parameter;
   }