Introduce string/regexp related public symbols.

src/js/symbol.js

Index: src/js/symbol.js
diff --git a/src/js/symbol.js b/src/js/symbol.js
index 5e79962034177c253210d6a6006e84fde184cf61..4a565cc5fd5408a0578b9b3820ced85d390884b7 100644
--- a/src/js/symbol.js
+++ b/src/js/symbol.js
@@ -19,7 +19,11 @@ var isConcatSpreadableSymbol =
 var isRegExpSymbol = utils.ImportNow("is_regexp_symbol");
 var iteratorSymbol = utils.ImportNow("iterator_symbol");
 var MakeTypeError;
+var matchSymbol = utils.ImportNow("match_symbol");
 var ObjectGetOwnPropertyKeys;
+var replaceSymbol = utils.ImportNow("replace_symbol");
+var searchSymbol = utils.ImportNow("search_symbol");
+var splitSymbol = utils.ImportNow("split_symbol");
 var toPrimitiveSymbol = utils.ImportNow("to_primitive_symbol");
 var toStringTagSymbol = utils.ImportNow("to_string_tag_symbol");
 var unscopablesSymbol = utils.ImportNow("unscopables_symbol");
@@ -96,6 +100,11 @@ utils.InstallConstants(GlobalSymbol, [
   // "isConcatSpreadable", isConcatSpreadableSymbol,
   // "isRegExp", isRegExpSymbol,
   "iterator", iteratorSymbol,
+  // TODO(yangguo): expose when implemented.
+  // "match", matchSymbol,
+  // "replace", replaceSymbol,
+  // "search", searchSymbol,
+  // "split, splitSymbol,
   "toPrimitive", toPrimitiveSymbol,
   // TODO(dslomov, caitp): Currently defined in harmony-tostring.js ---
   // Move here when shipping