Issue 25101. Flush TOKEN_STREAM after computing PARSED_UNIT.

[email protected]
BUG= #25101

Review URL: https://codereview.chromium.org/1495783005 .

Author: scheglov

pkg/analyzer/lib/src/task/dart.dart

@@ -3488,13 +3488,13 @@ class ParseDartTask extends SourceBasedAnalysisTask {
   /**
    * Return a map from the names of the inputs of this kind of task to the task
    * input descriptors describing those inputs for a task with the given
-   * [source].
+   * [target].
    */
   static Map<String, TaskInput> buildInputs(AnalysisTarget target) {
     return <String, TaskInput>{
       LINE_INFO_INPUT_NAME: LINE_INFO.of(target),
       MODIFICATION_TIME_INPUT_NAME: MODIFICATION_TIME.of(target),
-      TOKEN_STREAM_INPUT_NAME: TOKEN_STREAM.of(target)
+      TOKEN_STREAM_INPUT_NAME: TOKEN_STREAM.of(target, flushOnAccess: true)
     };
   }
 

pkg/analyzer/test/src/task/dart_test.dart

@@ -2913,6 +2913,13 @@ part 'test.dart';
     expect(outputs[UNITS], hasLength(1));
   }
 
+  test_perform_flushTokenStream() {
+    _performParseTask(r'''
+class Test {}
+''');
+    expect(analysisCache.getState(source, TOKEN_STREAM), CacheState.FLUSHED);
+  }
+
   test_perform_invalidDirectives() {
     _performParseTask(r'''
 library lib;