Revert "Remove Registry from registerMetadataConstant" and "Serialize metadata"

pkg/compiler/lib/src/enqueue.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.enqueue;
 
 import 'dart:collection' show Queue;
 
 import 'common/codegen.dart' show CodegenWorkItem;
 import 'common/names.dart' show Identifiers;
@@ skipping 431 matching lines @@
     }
   }
 
   /// Enqeue all local members of the library [lib] if they are required for
   /// reflection.
   void enqueueReflectiveElementsInLibrary(
       LibraryElement lib, Iterable<ClassElement> recents) {
     bool includeLibrary =
         shouldIncludeElementDueToMirrors(lib, includedEnclosing: false);
     lib.forEachLocalMember((Element member) {
-      if (member.isInjected) return;
       if (member.isClass) {
         enqueueReflectiveElementsInClass(member, recents, includeLibrary);
       } else {
         enqueueReflectiveMember(member, includeLibrary);
       }
     });
   }
 
   /// Enqueue all elements that are matched by the mirrors used
   /// annotation or, in lack thereof, all elements.
@@ skipping 553 matching lines @@
 }
 
 typedef void _DeferredActionFunction();
 
 class _DeferredAction {
   final Element element;
   final _DeferredActionFunction action;
 
   _DeferredAction(this.element, this.action);
 }