Add support for the new function-type syntax.

pkg/compiler/lib/src/elements/resolution_types.dart

Index: pkg/compiler/lib/src/elements/resolution_types.dart
diff --git a/pkg/compiler/lib/src/elements/resolution_types.dart b/pkg/compiler/lib/src/elements/resolution_types.dart
index b8ed4fb8c1b169a802d0f2ee00bcee4cae82245f..0f4b7bf10382f6be1c6ac6f5e8d5fef3efe3993d 100644
--- a/pkg/compiler/lib/src/elements/resolution_types.dart
+++ b/pkg/compiler/lib/src/elements/resolution_types.dart
@@ -642,6 +642,16 @@ class ResolutionFunctionType extends ResolutionDartType
         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>[],