dart2js: remove additionalProperties and store it directly as nativeBlob.

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);
 
   /**
    * Documentation wanted -- johnniwinther
    */
-  void emitClass(Class cls,
-                 ClassBuilder enclosingBuilder,
-                 Map<String, jsAst.Expression> additionalProperties) {
+  void emitClass(Class cls, ClassBuilder enclosingBuilder) {
     ClassElement classElement = cls.element;
 
     assert(invariant(classElement, classElement.isDeclaration));
 
     emitter.needsClassSupport = true;
 
     ClassElement superclass = classElement.superclass;
     String superName = "";
     if (superclass != null) {
       superName = namer.getNameOfClass(superclass);
     }
 
     if (cls.isMixinApplication) {
       MixinApplication mixinApplication = cls;
       String mixinName = mixinApplication.mixinClass.name;
       superName = '$superName+$mixinName';
       emitter.needsMixinSupport = true;
     }
 
     ClassBuilder builder = new ClassBuilder(classElement, namer);
     builder.superName = superName;
     emitConstructorsForCSP(cls);
     emitFields(cls, builder);
     emitCheckedClassSetters(cls, builder);
     emitClassGettersSettersForCSP(cls, builder);
     emitInstanceMembers(cls, builder);
     emitCallStubs(cls, builder);
     emitRuntimeTypeInformation(cls, builder);
-    if (additionalProperties != null) {
-      additionalProperties.forEach(builder.addProperty);
-    }
+    emitNativeInfo(cls, builder);
 
     if (classElement == backend.closureClass) {
       // We add a special getter here to allow for tearing off a closure from
       // itself.
       String name = namer.getMappedInstanceName(Compiler.CALL_OPERATOR_NAME);
       jsAst.Fun function = js('function() { return this; }');
       builder.addProperty(namer.getterNameFromAccessorName(name), function);
     }
 
     emitTypeVariableReaders(classElement, builder);
@@ skipping 205 matching lines @@
     assert(builder.functionType == null);
     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.addProperty(namer.nativeSpecProperty, js.string(cls.nativeInfo));
+    }
+  }
+
   void emitClassBuilderWithReflectionData(Class cls,
                                           ClassBuilder classBuilder,
                                           ClassBuilder enclosingBuilder) {
     ClassElement classElement = cls.element;
     String className = cls.name;
 
     var metadata = emitter.metadataEmitter.buildMetadataFunction(classElement);
     if (metadata != null) {
       classBuilder.addProperty("@", metadata);
     }
@@ skipping 302 matching lines @@
               js.number(index));
     }
     jsAst.Expression convertRtiToRuntimeType = emitter
         .staticFunctionAccess(backend.findHelper('convertRtiToRuntimeType'));
     compiler.dumpInfoTask.registerElementAst(element,
         builder.addProperty(name,
             js('function () { return #(#) }',
                 [convertRtiToRuntimeType, computeTypeVariable])));
   }
 }