Add top level type inference logic for integer literals.

pkg/front_end/lib/src/fasta/source/diet_listener.dart

 // Copyright (c) 2016, 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 fasta.diet_listener;
 
 import 'package:front_end/src/fasta/kernel/kernel_ast_factory.dart'
     show KernelAstFactory;
 
 import 'package:front_end/src/fasta/type_inference/type_inferrer.dart'
@@ skipping 117 matching lines @@
   void endMixinApplication(Token withKeyword) {
     debugEvent("MixinApplication");
   }
 
   @override
   void endTypeArguments(int count, Token beginToken, Token endToken) {
     debugEvent("TypeArguments");
   }
 
   @override
-  void endFieldInitializer(Token assignmentOperator) {
+  void endFieldInitializer(Token assignmentOperator, Token token) {
     debugEvent("FieldInitializer");
   }
 
   @override
   void handleNoFieldInitializer(Token token) {
     debugEvent("NoFieldInitializer");
   }
 
   @override
   void handleNoTypeVariables(Token token) {
@@ skipping 265 matching lines @@
         builder.computeFormalParameterScope(typeParameterScope);
     assert(typeParameterScope != null);
     assert(formalParameterScope != null);
     parseFunctionBody(
         createListener(builder, typeParameterScope, builder.isInstanceMember,
             formalParameterScope),
         token);
   }
 
   void buildFields(Token token, bool isTopLevel, MemberBuilder builder) {
+    // TODO(paulberry): don't re-parse the field if we've already parsed it
+    // for type inference.
     parseFields(createListener(builder, memberScope, builder.isInstanceMember),
         token, isTopLevel);
   }
 
   @override
   void endMember() {
     debugEvent("Member");
     checkEmpty(-1);
   }
 
@@ skipping 135 matching lines @@
   bool get isTargetingDartVm {
     // TODO(ahe): Find a more reliable way to check if this is the Dart VM.
     return !coreTypes.containsLibrary("dart:_js_helper");
   }
 
   @override
   void debugEvent(String name) {
     // printEvent(name);
   }
 }