Access BackendUsage through ClosedWorld

pkg/compiler/lib/src/compiler.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.compiler_base;
 
 import 'dart:async' show Future;
 
 import '../compiler_new.dart' as api;
 import 'backend_strategy.dart';
@@ skipping 622 matching lines @@
   ClosedWorldRefiner closeResolution() {
     phase = PHASE_DONE_RESOLVING;
 
     ClosedWorld closedWorld = resolutionWorldBuilder.closeWorld();
     ClosedWorldRefiner closedWorldRefiner =
         backendStrategy.createClosedWorldRefiner(closedWorld);
     // Compute whole-program-knowledge that the backend needs. (This might
     // require the information computed in [world.closeWorld].)
     backend.onResolutionClosedWorld(closedWorld, closedWorldRefiner);
 
-    deferredLoadTask.onResolutionComplete(mainFunction);
+    deferredLoadTask.onResolutionComplete(mainFunction, closedWorld);
 
     // TODO(johnniwinther): Move this after rti computation but before
     // reflection members computation, and (re-)close the world afterwards.
     backendStrategy.convertClosures(closedWorldRefiner);
     return closedWorldRefiner;
   }
 
   /// Compute the [WorldImpact] for accessing all elements in [library].
   WorldImpact computeImpactForLibrary(LibraryElement library) {
     WorldImpactBuilderImpl impactBuilder = new WorldImpactBuilderImpl();
@@ skipping 1031 matching lines @@
   _ElementScanner(this.scanner);
   void scanLibrary(LibraryElement library) => scanner.scanLibrary(library);
   void scanUnit(CompilationUnitElement unit) => scanner.scan(unit);
 }
 
 class _EmptyEnvironment implements Environment {
   const _EmptyEnvironment();
 
   String valueOf(String key) => null;
 }