Work around breaking task_dependency_graph/check_test because of a bug in AnalysisContext with gene…

pkg/analyzer/lib/src/dart/analysis/driver.dart

Index: pkg/analyzer/lib/src/dart/analysis/driver.dart
diff --git a/pkg/analyzer/lib/src/dart/analysis/driver.dart b/pkg/analyzer/lib/src/dart/analysis/driver.dart
index fdb01cb6064e6b4f71caba5eb3cde3f22f10c069..9c7d00664b41b7425a8776e895d20af01642de45 100644
--- a/pkg/analyzer/lib/src/dart/analysis/driver.dart
+++ b/pkg/analyzer/lib/src/dart/analysis/driver.dart
@@ -44,6 +44,13 @@ import 'package:front_end/src/base/performace_logger.dart';
 import 'package:front_end/src/byte_store/byte_store.dart';
 import 'package:meta/meta.dart';
 
+/**
+ * TODO(scheglov) We could use generalized Function in [AnalysisDriverTestView],
+ * but this breaks `AnalysisContext` and code generation. So, for now let's
+ * work around them, and rewrite generators to [AnalysisDriver].
+ */
+typedef Future<Null> WorkToWaitAfterComputingResult(String path);
+
 /**
  * This class computes [AnalysisResult]s for Dart files.
  *
@@ -1675,7 +1682,7 @@ class AnalysisDriverTestView {
 
   int numOfAnalyzedLibraries = 0;
 
-  Future<Null> Function(String path) workToWaitAfterComputingResult;
+  WorkToWaitAfterComputingResult workToWaitAfterComputingResult;
 
   AnalysisDriverTestView(this.driver);