Issue 27358. Reset AnalysisContext 'sourceFactory' and 'typeSystem' on analysis options change.

pkg/analysis_server/test/mock_sdk.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 testing.mock_sdk;
 
 import 'package:analyzer/file_system/file_system.dart' as resource;
 import 'package:analyzer/file_system/memory_file_system.dart' as resource;
 import 'package:analyzer/src/context/context.dart';
 import 'package:analyzer/src/generated/engine.dart';
@@ skipping 108 matching lines @@
 const Object deprecated = const Deprecated("next release");
 
 class Iterator<E> {
   bool moveNext();
   E get current;
 }
 
 abstract class Iterable<E> {
   Iterator<E> get iterator;
   bool get isEmpty;
+  Iterable/*<R>*/ map/*<R>*/(/*=R*/ f(E e));
 }
 
 abstract class List<E> implements Iterable<E> {
   void add(E value);
+  void addAll(Iterable<E> iterable) {}
   E operator [](int index);
   void operator []=(int index, E value);
   Iterator<E> get iterator => null;
   void clear();
 }
 
 abstract class Map<K, V> extends Object {
   bool containsKey(Object key);
   Iterable<K> get keys;
 }
@@ skipping 246 matching lines @@
   bool get isInternal => shortName.startsWith('dart:_');
 
   @override
   bool get isShared => throw unimplemented;
 
   @override
   bool get isVmLibrary => throw unimplemented;
 
   UnimplementedError get unimplemented => new UnimplementedError();
 }