Add ENUM and ENUM_CONSTANT to the specification.

pkg/analysis_server/lib/src/generated_protocol.dart

Index: pkg/analysis_server/lib/src/generated_protocol.dart
diff --git a/pkg/analysis_server/lib/src/generated_protocol.dart b/pkg/analysis_server/lib/src/generated_protocol.dart
index 85fcfcc2e64748cb519671dffdeae93dd40dcb4e..ccc138d86566a444db1e2ffcf2c4866ba4fd2ce3 100644
--- a/pkg/analysis_server/lib/src/generated_protocol.dart
+++ b/pkg/analysis_server/lib/src/generated_protocol.dart
@@ -6410,6 +6410,8 @@ class HighlightRegion implements HasToJson {
  *   CONSTRUCTOR
  *   DIRECTIVE
  *   DYNAMIC_TYPE
+ *   ENUM
+ *   ENUM_CONSTANT
  *   FIELD
  *   FIELD_STATIC
  *   FUNCTION
@@ -6458,6 +6460,10 @@ class HighlightRegionType implements Enum {
 
   static const DYNAMIC_TYPE = const HighlightRegionType._("DYNAMIC_TYPE");
 
+  static const ENUM = const HighlightRegionType._("ENUM");
+
+  static const ENUM_CONSTANT = const HighlightRegionType._("ENUM_CONSTANT");
+
   static const FIELD = const HighlightRegionType._("FIELD");
 
   static const FIELD_STATIC = const HighlightRegionType._("FIELD_STATIC");
@@ -6536,6 +6542,10 @@ class HighlightRegionType implements Enum {
         return DIRECTIVE;
       case "DYNAMIC_TYPE":
         return DYNAMIC_TYPE;
+      case "ENUM":
+        return ENUM;
+      case "ENUM_CONSTANT":
+        return ENUM_CONSTANT;
       case "FIELD":
         return FIELD;
       case "FIELD_STATIC":