Handle deferred access of unserialized code.

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 EventSink, Future;
 
 import '../compiler_new.dart' as api;
 import 'cache_strategy.dart' show CacheStrategy;
@@ skipping 2004 matching lines @@
         // cache [ResolutionImpact] and let the enqueuer transform it into
         // a [WorldImpact].
         _resolutionImpactCache[element] = resolutionImpact;
       }
       if (tree != null && !compiler.options.analyzeSignaturesOnly) {
         // TODO(het): don't do this if suppressWarnings is on, currently we have
         // to do it because the typechecker also sets types
         // Only analyze nodes with a corresponding [TreeElements].
         compiler.checker.check(element);
       }
-      WorldImpact worldImpact = compiler.backend.impactTransformer
-          .transformResolutionImpact(resolutionImpact);
-      return worldImpact;
+      return transformResolutionImpact(element, resolutionImpact);
     });
   }
 
   @override
+  WorldImpact transformResolutionImpact(
+      Element element, ResolutionImpact resolutionImpact) {
+    WorldImpact worldImpact = compiler.backend.impactTransformer
+        .transformResolutionImpact(resolutionImpact);
+    _worldImpactCache[element] = worldImpact;
+    return worldImpact;
+  }
+
+  @override
   void uncacheWorldImpact(Element element) {
     assert(invariant(element, element.isDeclaration,
         message: "Element $element must be the declaration."));
     if (retainCachesForTesting) return;
     if (compiler.serialization.isDeserialized(element)) return;
     assert(invariant(element, _worldImpactCache[element] != null,
         message: "WorldImpact not computed for $element."));
     _worldImpactCache[element] = const WorldImpact();
     _resolutionImpactCache.remove(element);
   }
@@ skipping 67 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;
 }