Support typedefs in function signatures.

sdk/lib/_internal/compiler/implementation/js_backend/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;
 
 /**
  * Assigns JavaScript identifiers to Dart variables, class-names and members.
  */
 class Namer implements ClosureNamer {
@@ skipping 803 matching lines @@
   /// of the other objects in [reservedGlobalObjectNames].
   bool isPropertyOfCurrentIsolate(Element element) {
     // TODO(ahe): Make sure this method's documentation is always true and
     // remove the word "intend".
     return
         // TODO(ahe): Re-write these tests to be positive (so it only returns
         // true for static/top-level mutable fields). Right now, a number of
         // other elements, such as bound closures also live in [currentIsolate].
         !element.isAccessor &&
         !element.isClass &&
+        !element.isTypedef &&
         !element.isConstructor &&
         !element.isFunction &&
         !element.isLibrary;
   }
 
   /// Returns [currentIsolate] or one of [reservedGlobalObjectNames].
   String globalObjectFor(Element element) {
     if (isPropertyOfCurrentIsolate(element)) return currentIsolate;
     LibraryElement library = element.library;
     if (library == backend.interceptorsLibrary) return 'J';
@@ skipping 41 matching lines @@
   }
 
   String globalObjectForConstant(Constant constant) => 'C';
 
   String operatorIsPrefix() => r'$is';
 
   String operatorAsPrefix() => r'$as';
 
   String operatorSignature() => r'$signature';
 
+  String typedefTag() => r'typedef';
+
   String functionTypeTag() => r'func';
 
   String functionTypeVoidReturnTag() => r'void';
 
   String functionTypeReturnTypeTag() => r'ret';
 
   String functionTypeRequiredParametersTag() => r'args';
 
   String functionTypeOptionalParametersTag() => r'opt';
 
@@ skipping 475 matching lines @@
         if (!first) {
           sb.write('_');
         }
         sb.write('_');
         visit(parameter);
         first = true;
       }
     }
   }
 }