Introduce OpenWorld.

pkg/compiler/lib/src/js_backend/backend.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 js_backend.backend;
 
 import 'dart:async' show Future;
 
 import 'package:js_runtime/shared/embedded_names.dart' as embeddedNames;
 
@@ skipping 890 matching lines @@
       if (elements == null) return null;
       return elements
           .where((element) => classesMixedIntoInterceptedClasses
               .contains(element.enclosingClass))
           .toSet();
     });
 
     if (elements == null) return false;
     if (elements.isEmpty) return false;
     return elements.any((element) {
-      return selector.applies(element, compiler.closedWorld) &&
+      return selector.applies(element, this) &&
           (mask == null ||
               mask.canHit(element, selector, compiler.closedWorld));
     });
   }
 
   /// True if the given class is an internal class used for type inference
   /// and never exists at runtime.
   bool isCompileTimeOnlyClass(ClassElement class_) {
     return class_ == helpers.jsPositiveIntClass ||
         class_ == helpers.jsUInt32Class ||
@@ skipping 1942 matching lines @@
           if (backend.compiler.options.enableTypeAssertions) {
             onIsCheck(type, transformed);
           }
           break;
         case TypeUseKind.CATCH_TYPE:
           onIsCheck(type, transformed);
           break;
         case TypeUseKind.TYPE_LITERAL:
           backend.customElementsAnalysis.registerTypeLiteral(type);
           if (type.isTypedef) {
-            backend.compiler.openWorld.allTypedefs.add(type.element);
+            backend.compiler.openWorld.registerTypedef(type.element);
           }
           if (type.isTypeVariable && type is! MethodTypeVariableType) {
             // GENERIC_METHODS: The `is!` test above filters away method type
             // variables, because they have the value `dynamic` with the
             // incomplete support for generic methods offered with
             // '--generic-method-syntax'. This must be revised in order to
             // support generic methods fully.
             ClassElement cls = type.element.enclosingClass;
             backend.rti.registerClassUsingTypeVariableExpression(cls);
             registerBackendImpact(transformed, impacts.typeVariableExpression);
@@ skipping 312 matching lines @@
 
   @override
   void onImpactUsed(ImpactUseCase impactUse) {
     if (impactUse == DeferredLoadTask.IMPACT_USE && !supportSerialization) {
       // TODO(johnniwinther): Allow emptying when serialization has been
       // performed.
       resolution.emptyCache();
     }
   }
 }