js_ast: implement rest/spread parsing

lib/runtime/dart/_js_mirrors.js

 dart_library.library('dart/_js_mirrors', null, /* Imports */[
   "dart_runtime/dart",
   'dart/_internal',
   'dart/core',
   'dart/mirrors'
 ], /* Lazy imports */[
 ], function(exports, dart, _internal, core, mirrors) {
   'use strict';
   let dartx = dart.dartx;
   function getName(symbol) {
@@ skipping 27 matching lines @@
   });
   function _dload(obj, name) {
     return exports._dart.dload(obj, name);
   }
   dart.fn(_dload, core.Object, [core.Object, core.String]);
   function _dput(obj, name, val) {
     exports._dart.dput(obj, name, val);
   }
   dart.fn(_dput, dart.void, [core.Object, core.String, core.Object]);
   function _dsend(obj, name, args) {
-    return exports._dart.dsendArray(obj, name, args);
+    return exports._dart.dsend(obj, name, ...args);
   }
   dart.fn(_dsend, core.Object, [core.Object, core.String, core.List]);
   let _toJsMap = Symbol('_toJsMap');
   class JsInstanceMirror extends core.Object {
     _(reflectee) {
       this.reflectee = reflectee;
     }
     getField(symbol) {
       let name = getName(symbol);
       let field = _dload(this.reflectee, name);
@@ skipping 139 matching lines @@
   exports.getName = getName;
   exports.getSymbol = getSymbol;
   exports.reflect = reflect;
   exports.reflectType = reflectType;
   exports.JsInstanceMirror = JsInstanceMirror;
   exports.JsClassMirror = JsClassMirror;
   exports.JsTypeMirror = JsTypeMirror;
   exports.JsParameterMirror = JsParameterMirror;
   exports.JsMethodMirror = JsMethodMirror;
 });