Semantic highlight async/await/sync/yield.

pkg/analysis_server/test/analysis/notification_highlights_test.dart

Index: pkg/analysis_server/test/analysis/notification_highlights_test.dart
diff --git a/pkg/analysis_server/test/analysis/notification_highlights_test.dart b/pkg/analysis_server/test/analysis/notification_highlights_test.dart
index 7a548177525b0ab6eefcaeac43ef8cf4460d5c3d..a12add97ae529aacf41f1dfbb45ff3f58d89de5b 100644
--- a/pkg/analysis_server/test/analysis/notification_highlights_test.dart
+++ b/pkg/analysis_server/test/analysis/notification_highlights_test.dart
@@ -161,6 +161,32 @@ main() {
     });
   }
 
+  test_BUILT_IN_async() {
+    addTestFile('''
+fa() async {}
+fb() async* {}
+main() {
+  bool async = false;
+}
+''');
+    return prepareHighlights().then((_) {
+      assertHasStringRegion(HighlightRegionType.BUILT_IN, 'async');
+      assertHasStringRegion(HighlightRegionType.BUILT_IN, 'async*');
+      assertNoRegion(HighlightRegionType.BUILT_IN, 'async = false');
+    });
+  }
+
+  test_BUILT_IN_await() {
+    addTestFile('''
+main() async {
+  await 42;
+}
+''');
+    return prepareHighlights().then((_) {
+      assertHasRegion(HighlightRegionType.BUILT_IN, 'await 42');
+    });
+  }
+
   test_BUILT_IN_deferred() {
     addTestFile('''
 import 'dart:math' deferred as math;
@@ -400,6 +426,21 @@ main() {
     });
   }
 
+  test_BUILT_IN_sync() {
+    addTestFile('''
+fa() sync {}
+fb() sync* {}
+main() {
+  bool sync = false;
+}
+''');
+    return prepareHighlights().then((_) {
+      assertHasStringRegion(HighlightRegionType.BUILT_IN, 'sync');
+      assertHasStringRegion(HighlightRegionType.BUILT_IN, 'sync*');
+      assertNoRegion(HighlightRegionType.BUILT_IN, 'sync = false');
+    });
+  }
+
   test_BUILT_IN_typedef() {
     addTestFile('''
 typedef A();
@@ -412,6 +453,28 @@ main() {
     });
   }
 
+  test_BUILT_IN_yield() {
+    addTestFile('''
+main() async* {
+  yield 42;
+}
+''');
+    return prepareHighlights().then((_) {
+      assertHasRegion(HighlightRegionType.BUILT_IN, 'yield 42');
+    });
+  }
+
+  test_BUILT_IN_yieldStar() {
+    addTestFile('''
+main() async* {
+  yield* [];
+}
+''');
+    return prepareHighlights().then((_) {
+      assertHasStringRegion(HighlightRegionType.BUILT_IN, 'yield*');
+    });
+  }
+
   test_CLASS() {
     addTestFile('''
 class AAA {}