Move nativeInfo encoding into NativeGenerator.

pkg/compiler/lib/src/js_emitter/old_emitter/class_emitter.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.
 
 part of dart2js.js_emitter;
 
 class ClassEmitter extends CodeEmitterHelper {
 
   ClassStubGenerator get _stubGenerator =>
       new ClassStubGenerator(compiler, namer, backend);
@@ skipping 257 matching lines @@
     if (cls.functionTypeIndex != null) {
       builder.functionType = cls.functionTypeIndex;
     }
 
     for (Method method in cls.isChecks) {
       builder.addProperty(method.name, method.code);
     }
   }
 
   void emitNativeInfo(Class cls, ClassBuilder builder) {
-    if (cls.nativeInfo != null) {
-      builder.addPropertyByName(namer.nativeSpecProperty, cls.nativeInfo);
+    jsAst.Expression nativeInfo = NativeGenerator.encodeNativeInfo(cls);
+    if (nativeInfo != null) {
+      builder.addPropertyByName(namer.nativeSpecProperty, nativeInfo);
     }
   }
 
   void emitClassBuilderWithReflectionData(Class cls,
                                           ClassBuilder classBuilder,
                                           ClassBuilder enclosingBuilder,
                                           Fragment fragment) {
     ClassElement classElement = cls.element;
     jsAst.Name className = cls.name;
 
@@ skipping 276 matching lines @@
         ? new Selector.getter(member.name, member.library)
         : new Selector.setter(member.name, member.library);
     String reflectionName = emitter.getReflectionName(selector, name);
     if (reflectionName != null) {
       var reflectable =
           js(backend.isAccessibleByReflection(member) ? '1' : '0');
       builder.addPropertyByName('+$reflectionName', reflectable);
     }
   }
 }