Introduces the new syntax for deferred loading

sdk/lib/_internal/compiler/implementation/library_loader.dart

Index: sdk/lib/_internal/compiler/implementation/library_loader.dart
diff --git a/sdk/lib/_internal/compiler/implementation/library_loader.dart b/sdk/lib/_internal/compiler/implementation/library_loader.dart
index 7daad88fd66af583eaa230139b6ead656d084a66..0c1a8d2168e2f89a36c7f1abc2683cdf4e99d008 100644
--- a/sdk/lib/_internal/compiler/implementation/library_loader.dart
+++ b/sdk/lib/_internal/compiler/implementation/library_loader.dart
@@ -556,6 +556,15 @@ class ImportLink {
         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, () {