Issue 26460. Add Quick Fix for missing 'Function.call()' implementation.

pkg/analysis_server/test/services/correction/fix_test.dart

 // Copyright (c) 2014, 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 test.services.correction.fix;
 
 import 'dart:async';
 
 import 'package:analysis_server/plugin/edit/fix/fix_core.dart';
 import 'package:analysis_server/plugin/edit/fix/fix_dart.dart';
@@ skipping 2236 matching lines @@
     await assertHasFix(
         DartFixKind.CREATE_LOCAL_VARIABLE,
         '''
 main() {
   int test;
   test += 42;
 }
 ''');
   }
 
+  test_createMissingMethodCall() async {
+    resolveTestUnit('''
+class C implements Function {
+}
+''');
+    await assertHasFix(
+        DartFixKind.CREATE_MISSING_METHOD_CALL,
+        '''
+class C implements Function {
+  call() {
+    // TODO: implement call
+  }
+}
+''');
+  }
+
   test_createMissingOverrides_field_untyped() async {
     resolveTestUnit('''
 class A {
   var f;
 }
 
 class B implements A {
 }
 ''');
     await assertHasFix(
@@ skipping 3046 matching lines @@
   @override
   void t() { }
 }
 ''');
   }
 
   void verifyResult(String expectedResult) {
     expect(resultCode, expectedResult);
   }
 }