Resynthesize constructor initializers from Kernel.

pkg/analyzer/test/src/summary/element_text.dart

 // Copyright (c) 2017, 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.
 
 import 'dart:io';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/type.dart';
@@ skipping 343 matching lines @@
         buffer.write('const ');
       }
       if (e.typeArguments != null) {
         writeList('<', '>', e.typeArguments.arguments, ', ', writeExpression);
       }
       writeList('{', '}', e.entries, ', ', writeExpression, includeEmpty: true);
     } else if (e is MapLiteralEntry) {
       writeExpression(e.key);
       buffer.write(': ');
       writeExpression(e.value);
+    } else if (e is MethodInvocation) {
+      if (e.target != null) {
+        writeExpression(e.target);
+        buffer.write(e.operator);
+      }
+      writeExpression(e.methodName);
+      if (e.typeArguments != null) {
+        writeList('<', '>', e.typeArguments.arguments, ', ', writeExpression);
+      }
+      writeList('(', ')', e.argumentList.arguments, ', ', writeExpression,
+          includeEmpty: true);
     } else if (e is NamedExpression) {
       writeExpression(e.name);
       buffer.write(e.expression);
     } else if (e is NullLiteral) {
       buffer.write('null');
     } else if (e is PrefixExpression) {
       buffer.write(e.operator.lexeme);
       writeExpression(e.operand, e);
     } else if (e is PrefixedIdentifier) {
       writeExpression(e.prefix);
@@ skipping 504 matching lines @@
     return components.join(';');
   }
 }
 
 class _Replacement {
   final int offset;
   final int end;
   final String text;
   _Replacement(this.offset, this.end, this.text);
 }