Serialize constant initializers.

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 0dc3c7b585346e137d60115be755ad556fd6bf68..e3969ae4eb1bb8ea80b7a128d92edccca1a586b7 100644
--- a/pkg/analyzer/lib/src/generated/testing/element_factory.dart
+++ b/pkg/analyzer/lib/src/generated/testing/element_factory.dart
@@ -559,8 +559,12 @@ class ElementFactory {
     if (isConst) {
       ConstTopLevelVariableElementImpl constant =
           new ConstTopLevelVariableElementImpl(AstFactory.identifier3(name));
-      constant.constantInitializer = AstFactory.instanceCreationExpression2(
+      InstanceCreationExpression initializer = AstFactory.instanceCreationExpression2(
           Keyword.CONST, AstFactory.typeName(type.element));
+      if (type is InterfaceType) {
+        initializer.staticElement = type.element.unnamedConstructor;
+      }
+      constant.constantInitializer = initializer;
       variable = constant;
     } else {
       variable = new TopLevelVariableElementImpl(name, -1);