Add top level type inference logic for integer literals.

pkg/analyzer/tool/summary/mini_ast.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 'package:front_end/src/fasta/errors.dart';
 import 'package:front_end/src/fasta/parser/identifier_context.dart';
 import 'package:front_end/src/fasta/parser/parser.dart';
 import 'package:front_end/src/fasta/scanner/token.dart';
 import 'package:front_end/src/fasta/source/stack_listener.dart';
 
@@ skipping 226 matching lines @@
       Token beginToken, Token factoryKeyword, Token endToken) {
     debugEvent("FactoryMethod");
     pop(); // Body
     ConstructorReference name = pop();
     List<Annotation> metadata = pop();
     Comment comment = pop();
     push(new ConstructorDeclaration(comment, metadata, name));
   }
 
   @override
-  void endFieldInitializer(Token assignment) {
+  void endFieldInitializer(Token assignment, Token token) {
     debugEvent("FieldInitializer");
     pop(); // Expression
   }
 
   @override
   void endFormalParameter(Token covariantKeyword, Token thisKeyword,
       Token nameToken, FormalParameterType kind) {
     debugEvent("FormalParameter");
     pop(); // Name
     pop(); // Type
@@ skipping 205 matching lines @@
   final String name;
 
   final List<TypeName> typeArguments;
 
   TypeName(this.name, this.typeArguments);
 }
 
 /// "Mini AST" representation of an expression which summary code generation
 /// need not be concerned about.
 class UnknownExpression extends Expression {}