Support serialization of WorldImpact

pkg/compiler/lib/src/patch_parser.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.
 
 /**
  * This library contains the infrastructure to parse and integrate patch files.
  *
  * Three types of elements can be patched: [LibraryElement], [ClassElement],
  * [FunctionElement]. Patches are introduced in patch libraries which are loaded
  * together with the corresponding origin library. Which libraries that are
@@ skipping 445 matching lines @@
     return null;
   }
 
   String apply(Compiler compiler,
              Element element,
              MetadataAnnotation annotation) {
     if (element.isClass) {
       String native = getNativeAnnotation(annotation);
       if (native != null) {
         JavaScriptBackend backend = compiler.backend;
-        backend.setNativeClassTagInfo(element, native);
+        backend.nativeData.setNativeClassTagInfo(element, native);
         return native;
       }
     }
     return null;
   }
 
   void validate(Compiler compiler,
                 Element element,
                 MetadataAnnotation annotation,
                 ConstantValue constant) {
@@ skipping 12 matching lines @@
 
   bool hasJsNameAnnotation(MetadataAnnotation annotation) =>
       annotation.beginToken != null && annotation.beginToken.next.value == 'JS';
 
   bool apply(Compiler compiler,
              Element element,
              MetadataAnnotation annotation) {
     bool hasJsInterop = hasJsNameAnnotation(annotation);
     if (hasJsInterop) {
       JavaScriptBackend backend = compiler.backend;
-      backend.markAsJsInterop(element);
+      backend.nativeData.markAsJsInterop(element);
     }
     // Due to semantics of apply in the baseclass we have to return null to
     // indicate that no match was found.
     return hasJsInterop ? true : null;
   }
 
   @override
   void validate(Compiler compiler,
                 Element element,
                 MetadataAnnotation annotation,
@@ skipping 186 matching lines @@
 
 class PatchVersion {
   final String tag;
 
   const PatchVersion(this.tag);
 
   bool isActive(String patchTag) => tag == null || tag == patchTag;
 
   String toString() => 'PatchVersion($tag)';
 }