Fix the build - add the new field.

pkg/analyzer/test/generated/engine_test.dart

Index: pkg/analyzer/test/generated/engine_test.dart
diff --git a/pkg/analyzer/test/generated/engine_test.dart b/pkg/analyzer/test/generated/engine_test.dart
index e2b20b39a149bc45e63753eede254d3f6c79c632..1b5282c8402e5bd33cb4bd819127045969851388 100644
--- a/pkg/analyzer/test/generated/engine_test.dart
+++ b/pkg/analyzer/test/generated/engine_test.dart
@@ -9,6 +9,7 @@ import 'dart:async';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/source/embedder.dart';
 import 'package:analyzer/src/context/cache.dart';
+import 'package:analyzer/src/context/context.dart';
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/constant.dart';
 import 'package:analyzer/src/generated/engine.dart';
@@ -192,6 +193,9 @@ class SourcesChangedListener {
  */
 class TestAnalysisContext implements InternalAnalysisContext {
   @override
+  ResultProvider resultProvider;
+
+  @override
   AnalysisCache get analysisCache {
     fail("Unexpected invocation of analysisCache");
     return null;