dart2js: Make usage of names more consistent between compiler and runtime.

sdk/lib/_internal/compiler/js_lib/foreign_helper.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.
 
 library _foreign_helper;
 
 /**
  * Emits a JavaScript code fragment parameterized by arguments.
  *
  * Hash characters `#` in the [codeTemplate] are replaced in left-to-right order
@@ skipping 190 matching lines @@
 String JS_IS_INDEXABLE_FIELD_NAME() {}
 
 /**
  * Returns the object corresponding to Namer.CURRENT_ISOLATE.
  */
 JS_CURRENT_ISOLATE() {}
 
 /// Returns the name used for generated function types on classes and methods.
 String JS_SIGNATURE_NAME() {}
 
+/// Returns the name used to tag typedefs.
+String JS_TYPEDEF_TAG() {}
+
 /// Returns the name used to tag function type representations in JavaScript.
 String JS_FUNCTION_TYPE_TAG() {}
 
 /**
  * Returns the name used to tag void return in function type representations
  * in JavaScript.
  */
 String JS_FUNCTION_TYPE_VOID_RETURN_TAG() {}
 
 /**
@@ skipping 63 matching lines @@
 }
 
 /**
  * JavaScript string concatenation. Inputs must be Strings.  Corresponds to the
  * HStringConcat SSA instruction and may be constant-folded.
  */
 String JS_STRING_CONCAT(String a, String b) {
   // This body is unused, only here for type analysis.
   return JS('String', '# + #', a, b);
 }