Use FileContentOverlay instead of ContentCache in the new driver.

pkg/analyzer/test/src/dart/analysis/driver_test.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 analyzer.test.driver;
 
 import 'dart:async';
 import 'dart:convert';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/error/error.dart';
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/file_system/memory_file_system.dart';
 import 'package:analyzer/source/package_map_resolver.dart';
 import 'package:analyzer/src/dart/analysis/byte_store.dart';
 import 'package:analyzer/src/dart/analysis/driver.dart';
+import 'package:analyzer/src/dart/analysis/file_state.dart';
 import 'package:analyzer/src/error/codes.dart';
 import 'package:analyzer/src/generated/engine.dart' show AnalysisOptionsImpl;
 import 'package:analyzer/src/generated/source.dart';
 import 'package:convert/convert.dart';
 import 'package:crypto/crypto.dart';
 import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../../context/mock_sdk.dart';
 
@@ skipping 16 matching lines @@
   // invoking this method.
   return new Future.delayed(Duration.ZERO, () => pumpEventQueue(times - 1));
 }
 
 @reflectiveTest
 class DriverTest {
   static final MockSdk sdk = new MockSdk();
 
   final MemoryResourceProvider provider = new MemoryResourceProvider();
   final ByteStore byteStore = new _TestByteStore();
-  final ContentCache contentCache = new ContentCache();
+  final FileContentOverlay contentOverlay = new FileContentOverlay();
   final StringBuffer logBuffer = new StringBuffer();
 
   AnalysisDriver driver;
   final _Monitor idleStatusMonitor = new _Monitor();
   final List<AnalysisStatus> allStatuses = <AnalysisStatus>[];
   final List<AnalysisResult> allResults = <AnalysisResult>[];
 
   String testProject;
   String testFile;
 
   void setUp() {
     new MockSdk();
     testProject = _p('/test/lib');
     testFile = _p('/test/lib/test.dart');
     driver = new AnalysisDriver(
         new PerformanceLog(logBuffer),
         provider,
         byteStore,
-        contentCache,
+        contentOverlay,
         new SourceFactory([
           new DartUriResolver(sdk),
           new PackageMapUriResolver(provider, <String, List<Folder>>{
             'test': [provider.getFolder(testProject)]
           })
         ], null, provider),
         new AnalysisOptionsImpl()..strongMode = true);
     driver.status.lastWhere((status) {
       allStatuses.add(status);
       if (status.isIdle) {
@@ skipping 471 matching lines @@
   @override
   List<int> get(String key) {
     return map[key];
   }
 
   @override
   void put(String key, List<int> bytes) {
     map[key] = bytes;
   }
 }