Reapply "Add support for generic function type syntax, part 1"

pkg/analysis_server/lib/src/computer/computer_highlights.dart

Index: pkg/analysis_server/lib/src/computer/computer_highlights.dart
diff --git a/pkg/analysis_server/lib/src/computer/computer_highlights.dart b/pkg/analysis_server/lib/src/computer/computer_highlights.dart
index 1214ea4c37701c8274b034a3ddeccf15690d1667..5768a885e10975cfe0237abf3f0ef86da8b28f8b 100644
--- a/pkg/analysis_server/lib/src/computer/computer_highlights.dart
+++ b/pkg/analysis_server/lib/src/computer/computer_highlights.dart
@@ -500,6 +500,19 @@ class _DartUnitHighlightsComputerVisitor extends RecursiveAstVisitor<Object> {
   }
 
   @override
+  Object visitGenericFunctionType(GenericFunctionType node) {
+    computer._addRegion_token(
+        node.functionKeyword, HighlightRegionType.KEYWORD);
+    return super.visitGenericFunctionType(node);
+  }
+
+  @override
+  Object visitGenericTypeAlias(GenericTypeAlias node) {
+    computer._addRegion_token(node.typedefKeyword, HighlightRegionType.KEYWORD);
+    return super.visitGenericTypeAlias(node);
+  }
+
+  @override
   Object visitHideCombinator(HideCombinator node) {
     computer._addRegion_token(node.keyword, HighlightRegionType.BUILT_IN);
     return super.visitHideCombinator(node);