Implement function-typed formal parameters in OutlineBuilder.

pkg/front_end/lib/src/fasta/source/outline_builder.dart

 // Copyright (c) 2016, 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 fasta.outline_builder;
 
 import 'package:kernel/ast.dart' show AsyncMarker, ProcedureKind;
 
 import '../fasta_codes.dart' show FastaMessage, codeExpectedBlockToSkip;
 
@@ skipping 492 matching lines @@
   @override
   void handleFormalParameterWithoutValue(Token token) {
     debugEvent("FormalParameterWithoutValue");
     // Ignored for now.
   }
 
   @override
   void endFunctionTypedFormalParameter(
       Token covariantKeyword, Token thisKeyword, FormalParameterType kind) {
     debugEvent("FunctionTypedFormalParameter");
-    pop(); // Function type parameters.
-    pop(); // Formals offset
-    pop(); // Type variables.
+    List<FormalParameterBuilder> formals = pop();
+    int formalsOffset = pop();
+    List<TypeVariableBuilder> typeVariables = pop();
     int charOffset = pop();
     String name = pop();
-    pop(); // Return type.
-    push(NullValue.Type);
+    TypeBuilder returnType = pop();
+    push(library.addFunctionType(
+        returnType, typeVariables, formals, formalsOffset));
     push(name);
     push(charOffset);
   }
 
   @override
   void endOptionalFormalParameters(
       int count, Token beginToken, Token endToken) {
     debugEvent("OptionalFormalParameters");
     FormalParameterType kind = optional("{", beginToken)
         ? FormalParameterType.NAMED
@@ skipping 287 matching lines @@
   Link<Token> handleMemberName(Link<Token> identifiers) {
     if (!isDartLibrary || identifiers.isEmpty) return identifiers;
     return removeNativeClause(identifiers);
   }
 
   @override
   void debugEvent(String name) {
     // printEvent(name);
   }
 }