expose strong checker API, for use by analyzer_cli

test/checker/inferred_type_test.dart

 // Copyright (c) 2015, 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.
 
 /// Tests for type inference.
 library dev_compiler.test.inferred_type_test;
 
 import 'package:test/test.dart';
 
 import 'package:dev_compiler/src/testing.dart';
@@ skipping 937 matching lines @@
         }
 
         foo () {
           int y = /*severe:StaticTypeError*/new B<String>().m(null, null).value;
           String z = new B<String>().m(null, null).value;
         }
     '''
     }, inferFromOverrides: true);
   });
 
-  test('do not infer overriden fields that explicitly say dynamic', () {
+  test('do not infer overridden fields that explicitly say dynamic', () {
     for (bool infer in [true, false]) {
       testChecker({
         '/main.dart': '''
           class A {
             int x = 2;
           }
 
           class B implements A {
             /*severe:InvalidMethodOverride*/dynamic get x => 3;
           }
@@ skipping 548 matching lines @@
   });
 
   test('inferred initializing formal checks default value', () => testChecker({
     '/main.dart': '''
       class Foo {
         var x = 1;
         Foo([this.x = /*severe:StaticTypeError*/"1"]);
       }'''
   }));
 }