Add annotations on native fields and methods

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

 // Copyright (c) 2012, 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 _interceptors;
 
 /**
  * The interceptor class for [List]. The compiler recognizes this
  * class as an interceptor, and changes references to [:this:] to
  * actually use the receiver of the method, which is generated as an extra
@@ skipping 60 matching lines @@
     checkNull(length); // TODO(ahe): This is not specified but co19 tests it.
     if (start is !int) throw new ArgumentError(start);
     if (length is !int) throw new ArgumentError(length);
     if (length < 0) throw new ArgumentError(length);
     if (start < 0) throw new RangeError.value(start);
     int end = start + length;
     if (end > this.length) {
       throw new RangeError.value(length);
     }
     if (length < 0) throw new ArgumentError(length);
-    return JS('List', r'#.slice(#, #)', this, start, end);
+    return JS('=List', r'#.slice(#, #)', this, start, end);
   }
 
   void insertRange(int start, int length, [E initialValue]) {
     return listInsertRange(this, start, length, initialValue);
   }
 
   E get last => this[length - 1];
 
   E get first => this[0];
 
@@ skipping 70 matching lines @@
   bool get isEmpty => length == 0;
 
   String toString() => Collections.collectionToString(this);
 
   ListIterator iterator() => new ListIterator(this);
 
   int get hashCode => Primitives.objectHashCode(receiver);
 
   Type get runtimeType => createRuntimeType('List');
 }