fixes #415, correct type for map literals

lib/runtime/dart/_operations.js

 // Copyright (c) 2015, 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 defines runtime operations on objects used by the code
  * generator.
  */
 dart_library.library('dart/_operations', null, /* Imports */[
 ], /* Lazy Imports */[
   'dart/_utils',
@@ skipping 260 matching lines @@
    * `map({'hi': 1, 'there': 2})`.
    *
    * Otherwise an array should be used, for example `map([1, 2, 3, 4])` will
    * create a map with keys [1, 3] and values [2, 4]. Each key-value pair
    * should be adjacent entries in the array.
    *
    * For a map with no keys the function can be called with no arguments, for
    * example `map()`.
    */
   // TODO(jmesserly): this could be faster
-  function map(values) {
-    let map = collection.LinkedHashMap.new();
+  function map(values, K, V) {

[vsm, 2016/01/20 23:39:33]

FWIW, dart.list is in _classes.  Kind of strange that these ended up in
different places.

[Jennifer Messerly, 2016/02/01 23:39:48]

Nice find. Added TODO.

+    if (K === void 0) K = types.dynamic;
+    if (V === void 0) V = types.dynamic;
+    let map = collection.LinkedHashMap$(K, V).new();
     if (Array.isArray(values)) {
       for (let i = 0, end = values.length - 1; i < end; i += 2) {
         let key = values[i];
         let value = values[i + 1];
         map.set(key, value);
       }
     } else if (typeof values === 'object') {
       for (let key of getOwnPropertyNames(values)) {
         map.set(key, values[key]);
       }
@@ skipping 165 matching lines @@
     next() {
       let i = this.dartIterator;
       let done = !i.moveNext();
       return { done: done, value: done ? void 0 : i.current };
     }
   }
   exports.JsIterator = JsIterator;
 
 
 });