Introduces the new syntax for deferred loading

sdk/lib/_internal/compiler/implementation/library_loader.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.
 
 part of dart2js;
 
 /**
  * [CompilerTask] for loading libraries and setting up the import/export scopes.
  *
  * The library loader uses four different kinds of URIs in different parts of
@@ skipping 538 matching lines @@
         prefixElement = new PrefixElementX(prefix,
             importingLibrary.entryCompilationUnit, import.getBeginToken());
       } else {
         prefixElement = existingElement;
       }
       importingLibrary.addToScope(prefixElement, compiler);
       importedLibrary.forEachExport((Element element) {
         if (combinatorFilter.exclude(element)) return;
         prefixElement.addImport(element, import, compiler);
       });
+      if (import.isDeferred) {
+        prefixElement.addImport(
+            new DeferredLoaderGetterElementX(prefixElement),
+            import, compiler);
+        // TODO(sigurdm): When we remove support for the annotation based
+        // syntax the [PrefixElement] constructor should receive this
+        // information.
+        prefixElement.markAsDeferred(import);
+      }
     } else {
       importedLibrary.forEachExport((Element element) {
         compiler.withCurrentElement(importingLibrary, () {
           if (combinatorFilter.exclude(element)) return;
           importingLibrary.addImport(element, import, compiler);
         });
       });
     }
   }
 }
@@ skipping 351 matching lines @@
   }
 
   /**
    * Registers all top-level entities of [library] as starting point for the
    * fixed-point computation of the import/export scopes.
    */
   void registerLibraryExports(LibraryElement library) {
     nodeMap[library].registerInitialExports();
   }
 }