Extract unresolved AST parsing (PARSED_UNIT1) from full parsing, which includes UriBasedDirective(s…

pkg/analyzer/lib/src/plugin/engine_plugin.dart

Index: pkg/analyzer/lib/src/plugin/engine_plugin.dart
diff --git a/pkg/analyzer/lib/src/plugin/engine_plugin.dart b/pkg/analyzer/lib/src/plugin/engine_plugin.dart
index 8e477079c700c12918aa2de87b3c0b2766300c16..516500f6073b067a74767b6e2af2ad743d8dfaa1 100644
--- a/pkg/analyzer/lib/src/plugin/engine_plugin.dart
+++ b/pkg/analyzer/lib/src/plugin/engine_plugin.dart
@@ -170,6 +170,7 @@ class EnginePlugin implements Plugin {
 
   void _registerDartErrorsForSource(RegisterExtension registerExtension) {
     registerExtension(DART_ERRORS_FOR_SOURCE_EXTENSION_POINT_ID, PARSE_ERRORS);
+    registerExtension(DART_ERRORS_FOR_SOURCE_EXTENSION_POINT_ID, RESOLVE_DIRECTIVES_ERRORS);
     registerExtension(DART_ERRORS_FOR_SOURCE_EXTENSION_POINT_ID, SCAN_ERRORS);
   }
 
@@ -231,6 +232,7 @@ class EnginePlugin implements Plugin {
     registerExtension(taskId, ReadyLibraryElement6Task.DESCRIPTOR);
     registerExtension(taskId, ReadyResolvedUnitTask.DESCRIPTOR);
     registerExtension(taskId, ResolveConstantExpressionTask.DESCRIPTOR);
+    registerExtension(taskId, ResolveDirectivesTask.DESCRIPTOR);
     registerExtension(taskId, ResolveDirectiveElementsTask.DESCRIPTOR);
     registerExtension(taskId, ResolveInstanceFieldsInUnitTask.DESCRIPTOR);
     registerExtension(taskId, ResolveLibraryReferencesTask.DESCRIPTOR);