Expose well-known Symbols to C++ API.

test/cctest/test-api.cc

Index: test/cctest/test-api.cc
diff --git a/test/cctest/test-api.cc b/test/cctest/test-api.cc
index f61400706b35bb7bfadb72aaa8b0b6d4663eade5..b503332369e29ed6d0785c1c458efb888be9e21d 100644
--- a/test/cctest/test-api.cc
+++ b/test/cctest/test-api.cc
@@ -2914,6 +2914,10 @@ THREADED_TEST(GlobalSymbols) {
   CHECK(glob_api2->SameValue(glob_api));
   CHECK(!glob_api->SameValue(glob));
 
+  v8::Local<String> iterator_name = v8_str("Symbol.iterator");
+  v8::Local<v8::Symbol> iterator =
+      v8::Symbol::ForInternal(isolate, iterator_name);
+
   v8::Local<v8::Symbol> sym = v8::Symbol::New(isolate, name);
   CHECK(!sym->SameValue(glob));
 
@@ -2921,6 +2925,11 @@ THREADED_TEST(GlobalSymbols) {
   v8::Local<Value> sym2 = env->Global()->Get(v8_str("sym2"));
   CHECK(sym2->SameValue(glob));
   CHECK(!sym2->SameValue(glob_api));
+
+  CompileRun("var sym3 = Symbol.iterator");
+  v8::Local<Value> sym3 = env->Global()->Get(v8_str("sym3"));
+  CHECK(!sym3.IsEmpty());
+  CHECK(sym3->SameValue(iterator));
 }