Streamline AnalysisDriver status tracking.

pkg/analyzer/test/src/dart/analysis/base.dart

Index: pkg/analyzer/test/src/dart/analysis/base.dart
diff --git a/pkg/analyzer/test/src/dart/analysis/base.dart b/pkg/analyzer/test/src/dart/analysis/base.dart
index 58075bdc97ff24509c7348fcfdd24f8a4edd82a6..51a01ed49df189488e3d9e3c974d4ab631322ef3 100644
--- a/pkg/analyzer/test/src/dart/analysis/base.dart
+++ b/pkg/analyzer/test/src/dart/analysis/base.dart
@@ -124,7 +124,7 @@ class BaseAnalysisDriverTest {
         ], null, provider),
         new AnalysisOptionsImpl()..strongMode = true);
     scheduler.start();
-    driver.status.listen(allStatuses.add);
+    scheduler.status.listen(allStatuses.add);
     driver.results.listen(allResults.add);
     driver.exceptions.listen(allExceptions.add);
   }