Use shorter names for some standard properties on closures.

pkg/compiler/lib/src/js_backend/minify_namer.dart

 // Copyright (c) 2011, 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 js_backend.namer;
 
 /**
  * Assigns JavaScript identifiers to Dart variables, class-names and members.
  */
 class MinifyNamer extends Namer
@@ skipping 10 matching lines @@
 
   _FieldNamingRegistry fieldRegistry;
 
   String get isolateName => 'I';
   String get isolatePropertiesName => 'p';
   bool get shouldMinify => true;
 
   final String getterPrefix = 'g';
   final String setterPrefix = 's';
   final String callPrefix = ''; // this will create function names $<n>
+  String get requiredParameterField => r'$R';
+  String get defaultValuesField => r'$D';
+  String get operatorSignature => r'$S';
 
   final ALPHABET_CHARACTERS = 52; // a-zA-Z.
   final ALPHANUMERIC_CHARACTERS = 62; // a-zA-Z0-9.
 
   /// You can pass an invalid identifier to this and unlike its non-minifying
   /// counterpart it will never return the proposedName as the new fresh name.
   ///
   /// [sanitizeForNatives] and [sanitizeForAnnotations] are ignored because the
   /// minified names will always avoid clashing with annotated names or natives.
   @override
@@ skipping 340 matching lines @@
     String prefix =
         selector.isGetter ? r"$get" : selector.isSetter ? r"$set" : "";
     String callSuffix = selector.isCall
         ? callSuffixForStructure(selector.callStructure).join()
         : "";
     String suffix = suffixForGetInterceptor(classes);
     String fullName = "\$intercepted$prefix\$$root$callSuffix\$$suffix";
     return _disambiguateInternalGlobal(fullName);
   }
 }