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..a13a6e5f2913f050bfdde02aba0aa3bc6dfb133a 100644
--- a/test/cctest/test-api.cc
+++ b/test/cctest/test-api.cc
@@ -2924,6 +2924,29 @@ THREADED_TEST(GlobalSymbols) {
 }
 
 
+static void CheckWellKnownSymbol(v8::Local<v8::Symbol>(*getter)(v8::Isolate*),
+                                 const char* name) {
+  LocalContext env;
+  v8::Isolate* isolate = env->GetIsolate();
+  v8::HandleScope scope(isolate);
+
+  v8::Local<v8::Symbol> symbol = getter(isolate);
+  std::string script = std::string("var sym = ") + name;
+  CompileRun(script.c_str());
+  v8::Local<Value> value = env->Global()->Get(v8_str("sym"));
+
+  CHECK(!value.IsEmpty());
+  CHECK(!symbol.IsEmpty());
+  CHECK(value->SameValue(symbol));
+}
+
+
+THREADED_TEST(WellKnownSymbols) {
+  CheckWellKnownSymbol(v8::Symbol::GetIterator, "Symbol.iterator");
+  CheckWellKnownSymbol(v8::Symbol::GetUnscopables, "Symbol.unscopables");
+}
+
+
 THREADED_TEST(GlobalPrivates) {
   LocalContext env;
   v8::Isolate* isolate = env->GetIsolate();