Add @JSName annotation for native fields and methods - second try.

sdk/lib/_internal/compiler/implementation/lib/js_helper.dart

Index: sdk/lib/_internal/compiler/implementation/lib/js_helper.dart
diff --git a/sdk/lib/_internal/compiler/implementation/lib/js_helper.dart b/sdk/lib/_internal/compiler/implementation/lib/js_helper.dart
index f10d3d72408a924c2bf51196010434ddaa2dc7e6..7b046c9e48160576788e171478b5ff946933fceb 100644
--- a/sdk/lib/_internal/compiler/implementation/lib/js_helper.dart
+++ b/sdk/lib/_internal/compiler/implementation/lib/js_helper.dart
@@ -557,7 +557,7 @@ class Primitives {
       if (end <= kMaxApply) {
         subarray = array;
       } else {
-        subarray = JS('List<int>', r'array.slice(#, #)',
+        subarray = JS('=List', r'array.slice(#, #)',
                       i, i + kMaxApply < end ? i + kMaxApply : end);
       }
       result = JS('String', '# + String.fromCharCode.apply(#, #)',
@@ -1220,6 +1220,23 @@ class Returns {
 }
 
 /**
+ * A metadata annotation placed on native methods and fields of native classes
+ * to specify the JavaScript name.
+ *
+ * This example declares a Dart field + getter + setter called `$dom_title` that
+ * corresponds to the JavaScript property `title`.
+ *
+ *     class Docmument native "*Foo" {
+ *       @JSName('title')
+ *       String $dom_title;
+ *     }
+ */
+class JSName {
+  final String name;
+  const JSName(this.name);
+}
+
+/**
  * Represents the type of Null. The compiler treats this specially.
  * TODO(lrn): Null should be defined in core. It's a class, like int.
  * It just happens to act differently in assignability tests and,