Load patches via callback.

sdk/lib/_internal/compiler/implementation/elements/modelx.dart

 // Copyright (c) 2013, 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 elements.modelx;
 
 import 'elements.dart';
 import '../helpers/helpers.dart';
 import '../tree/tree.dart';
 import '../util/util.dart';
@@ skipping 952 matching lines @@
 
   bool get isPlatformLibrary => canonicalUri.scheme == 'dart';
 
   bool get isPackageLibrary => canonicalUri.scheme == 'package';
 
   bool get isInternalLibrary =>
       isPlatformLibrary && canonicalUri.path.startsWith('_');
 
   String toString() {
     if (origin != null) {
-      return 'patch library(${getLibraryOrScriptName()})';
+      return 'patch library(${canonicalUri})';
     } else if (patch != null) {
-      return 'origin library(${getLibraryOrScriptName()})';
+      return 'origin library(${canonicalUri})';
     } else {
-      return 'library(${getLibraryOrScriptName()})';
+      return 'library(${canonicalUri})';
     }
   }
 
   int compareTo(LibraryElement other) {
     if (this == other) return 0;
     return getLibraryOrScriptName().compareTo(other.getLibraryOrScriptName());
   }
 
   accept(ElementVisitor visitor) => visitor.visitLibraryElement(this);
 
@@ skipping 1589 matching lines @@
     assert(invariant(this, this.origin == null,
                      message: "Origin element is a patch."));
     assert(invariant(patch, patch.origin == null,
                      message: "Element is patched twice."));
     assert(invariant(patch, patch.patch == null,
                      message: "Patch element is patched."));
     this.patch = patch;
     patch.origin = this;
   }
 }