Add documentation comments for enum and enum values. Resynthesize in analyzer.

pkg/front_end/lib/src/fasta/kernel/kernel_library_builder.dart

Index: pkg/front_end/lib/src/fasta/kernel/kernel_library_builder.dart
diff --git a/pkg/front_end/lib/src/fasta/kernel/kernel_library_builder.dart b/pkg/front_end/lib/src/fasta/kernel/kernel_library_builder.dart
index d8df4f86fc88338d1476241da82eef9b8281e558..b44c03af86a7b62232e7f2e1632617dec896cd67 100644
--- a/pkg/front_end/lib/src/fasta/kernel/kernel_library_builder.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/kernel_library_builder.dart
@@ -653,12 +653,17 @@ class KernelLibraryBuilder
     }
   }
 
-  void addEnum(List<MetadataBuilder> metadata, String name,
-      List<Object> constantNamesAndOffsets, int charOffset, int charEndOffset) {
+  void addEnum(
+      String documentationComment,
+      List<MetadataBuilder> metadata,
+      String name,
+      List<Object> constantNamesAndOffsets,
+      int charOffset,
+      int charEndOffset) {
     addBuilder(
         name,
-        new KernelEnumBuilder(metadata, name, constantNamesAndOffsets, this,
-            charOffset, charEndOffset),
+        new KernelEnumBuilder(documentationComment, metadata, name,
+            constantNamesAndOffsets, this, charOffset, charEndOffset),
         charOffset);
   }