ES6 symbols: Implement Symbol intrinsic and basic functionality

src/bootstrapper.cc

Index: src/bootstrapper.cc
diff --git a/src/bootstrapper.cc b/src/bootstrapper.cc
index cf5ad11f74056ff5b70c846801919054cc2a7724..1824d220039c68b754045a235c34e5a5a9974715 100644
--- a/src/bootstrapper.cc
+++ b/src/bootstrapper.cc
@@ -1418,6 +1418,9 @@ void Genesis::InstallNativeFunctions() {
 }
 
 void Genesis::InstallExperimentalNativeFunctions() {
+  if (FLAG_harmony_symbols) {
+    INSTALL_NATIVE(JSObject, "SymbolDelegate", symbol_delegate);
+  }
   if (FLAG_harmony_proxies) {
     INSTALL_NATIVE(JSFunction, "DerivedHasTrap", derived_has_trap);
     INSTALL_NATIVE(JSFunction, "DerivedGetTrap", derived_get_trap);
@@ -1845,6 +1848,11 @@ bool Genesis::InstallExperimentalNatives() {
   for (int i = ExperimentalNatives::GetDebuggerCount();
        i < ExperimentalNatives::GetBuiltinsCount();
        i++) {
+    if (FLAG_harmony_symbols &&
+        strcmp(ExperimentalNatives::GetScriptName(i).start(),
+               "native symbol.js") == 0) {
+      if (!CompileExperimentalBuiltin(isolate(), i)) return false;
+    }
     if (FLAG_harmony_proxies &&
         strcmp(ExperimentalNatives::GetScriptName(i).start(),
                "native proxy.js") == 0) {