Implement reflection on native classes.

dart/sdk/lib/_internal/compiler/implementation/js_backend/native_emitter.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 js_backend;
 
 class NativeEmitter {
 
   CodeEmitterTask emitter;
   CodeBuffer nativeBuffer;
@@ skipping 214 matching lines @@
       }
       generateDefines(backend.jsInterceptorClass);
       for (ClassElement classElement in classes) {
         generateDefines(classElement);
       }
     }
 
     // Emit the native class interceptors that were actually used.
     for (ClassElement classElement in classes) {
       if (neededClasses.contains(classElement)) {
-        ClassBuilder builder = builders[classElement];
         // Define interceptor class for [classElement].
-        String className = backend.namer.getName(classElement);
-        jsAst.Expression init =
-            js(emitter.classesCollector)[className].assign(
-                builder.toObjectInitializer());
-        mainBuffer.write(jsAst.prettyPrint(init, compiler));
-        mainBuffer.write('$N$n');
+        emitter.emitClassBuilderWithReflectionData(
+            backend.namer.getName(classElement),
+            classElement, builders[classElement],
+            emitter.bufferForElement(classElement, mainBuffer));
         emitter.needsDefineClass = true;
       }
     }
   }
 
   ClassBuilder generateNativeClass(ClassElement classElement) {
     assert(!classElement.hasBackendMembers);
     nativeClasses.add(classElement);
 
     ClassElement superclass = classElement.superclass;
@@ skipping 194 matching lines @@
       if (emitter.compiler.enableMinification) targetBuffer.add(';');
       targetBuffer.add(jsAst.prettyPrint(
           new jsAst.ExpressionStatement(init), compiler));
       targetBuffer.add('\n');
     }
 
     targetBuffer.add(nativeBuffer);
     targetBuffer.add('\n');
   }
 }