Initial experimental Kythe Dart Analysis Server protocol

pkg/analysis_server/lib/protocol/protocol_constants.dart

Index: pkg/analysis_server/lib/protocol/protocol_constants.dart
diff --git a/pkg/analysis_server/lib/protocol/protocol_constants.dart b/pkg/analysis_server/lib/protocol/protocol_constants.dart
index 1f494ff4b8b23b91a587fcfdb290fea733505c48..c28d2f0e360690a56a22e2e3010f0486fbf75219 100644
--- a/pkg/analysis_server/lib/protocol/protocol_constants.dart
+++ b/pkg/analysis_server/lib/protocol/protocol_constants.dart
@@ -206,6 +206,10 @@ const String EXECUTION_REQUEST_SET_SUBSCRIPTIONS_SUBSCRIPTIONS =
 const String EXECUTION_RESPONSE_CREATE_CONTEXT_ID = 'id';
 const String EXECUTION_RESPONSE_MAP_URI_FILE = 'file';
 const String EXECUTION_RESPONSE_MAP_URI_URI = 'uri';
+const String KYTHE_REQUEST_GET_KYTHE_ENTRIES = 'kythe.getKytheEntries';
+const String KYTHE_REQUEST_GET_KYTHE_ENTRIES_FILE = 'file';
+const String KYTHE_RESPONSE_GET_KYTHE_ENTRIES_ENTRIES = 'entries';
+const String KYTHE_RESPONSE_GET_KYTHE_ENTRIES_FILES = 'files';
 const String SEARCH_NOTIFICATION_RESULTS = 'search.results';
 const String SEARCH_NOTIFICATION_RESULTS_ID = 'id';
 const String SEARCH_NOTIFICATION_RESULTS_IS_LAST = 'isLast';