Use WorldImpact for element dependencies in deferred_load

pkg/compiler/lib/src/enqueue.dart

 // Copyright (c) 2012, 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 dart2js.enqueue;
 
 import 'dart:collection' show
     Queue;
 
 import 'common.dart';
@@ skipping 94 matching lines @@
   // support serialization.
   Iterable<DartType> get isChecks => const <DartType>[];
 
   Iterable<DartType> get checkedModeChecks => const <DartType>[];
 
   Iterable<DartType> get asCasts => const <DartType>[];
 
   Iterable<MethodElement> get closurizedFunctions => const <MethodElement>[];
 
   Iterable<LocalFunctionElement> get closures => const <LocalFunctionElement>[];
+
+  Iterable<DartType> get typeLiterals => const <DartType>[];
+
+  String toString() {
+    StringBuffer sb = new StringBuffer();
+
+    void add(String title, Iterable iterable) {
+      if (iterable.isNotEmpty) {
+        sb.write('\n $title:');
+        iterable.forEach((e) => sb.write('\n  $e'));
+      }
+    }
+
+    add('dynamic invocations', dynamicInvocations);
+    add('dynamic getters', dynamicGetters);
+    add('dynamic setters', dynamicSetters);
+    add('static uses', staticUses);
+    add('instantiated types', instantiatedTypes);
+    add('is-checks', isChecks);
+    add('checked-mode checks', checkedModeChecks);
+    add('as-casts', asCasts);
+    add('closurized functions', closurizedFunctions);
+    add('closures', closures);
+    add('type literals', typeLiterals);
+
+    return sb.toString();
+  }
 }
 
 abstract class Enqueuer {
   final String name;
   final Compiler compiler; // TODO(ahe): Remove this dependency.
   final EnqueuerStrategy strategy;
   final ItemCompilationContextCreator itemCompilationContextCreator;
   final Map<String, Set<Element>> instanceMembersByName
       = new Map<String, Set<Element>>();
   final Map<String, Set<Element>> instanceFunctionsByName
@@ skipping 958 matching lines @@
   @override
   void processStaticUse(Enqueuer enqueuer, Element element) {
     enqueuer.registerStaticUseInternal(element);
   }
 
   @override
   void processSelector(Enqueuer enqueuer, UniverseSelector selector) {
     enqueuer.handleUnseenSelectorInternal(selector);
   }
 }