Add support for the new function-type syntax.

pkg/compiler/lib/src/elements/resolution_types.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.
 
 /// Implementation of the Dart types hierarchy in 'types.dart' specifically
 /// tailored to the resolution phase of the compiler.
 
 library resolution_types;
 
 import 'dart:math' show min;
@@ skipping 624 matching lines @@
       List<ResolutionDartType> parameterTypes = const <ResolutionDartType>[],
       List<ResolutionDartType> optionalParameterTypes =
           const <ResolutionDartType>[],
       List<String> namedParameters = const <String>[],
       List<ResolutionDartType> namedParameterTypes =
           const <ResolutionDartType>[]]) {
     return new ResolutionFunctionType.internal(null, returnType, parameterTypes,
         optionalParameterTypes, namedParameters, namedParameterTypes);
   }
 
+  factory ResolutionFunctionType.generalized(
+      ResolutionDartType returnType,
+      List<ResolutionDartType> parameterTypes,
+      List<ResolutionDartType> optionalParameterTypes,
+      List<String> namedParameters,
+      List<ResolutionDartType> namedParameterTypes) {
+    return new ResolutionFunctionType.internal(null, returnType, parameterTypes,
+        optionalParameterTypes, namedParameters, namedParameterTypes);
+  }
+
   ResolutionFunctionType.internal(FunctionTypedElement this.element,
       [ResolutionDartType returnType = const ResolutionDynamicType(),
       List<ResolutionDartType> parameterTypes = const <ResolutionDartType>[],
       List<ResolutionDartType> optionalParameterTypes =
           const <ResolutionDartType>[],
       List<String> namedParameters = const <String>[],
       List<ResolutionDartType> namedParameterTypes =
           const <ResolutionDartType>[]])
       : this.returnType = returnType,
         this.parameterTypes = parameterTypes,
@@ skipping 1410 matching lines @@
           sb.write(', ');
         }
         namedParameterTypes[index].accept(this, namedParameters[index]);
         needsComma = true;
       }
       sb.write('}');
     }
     sb.write(')');
   }
 }