Expose well-known Symbols to C++ API.

test/cctest/test-api.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 2906 matching lines @@
   v8::Local<v8::Symbol> sym = v8::Symbol::New(isolate, name);
   CHECK(!sym->SameValue(glob));
 
   CompileRun("var sym2 = Symbol.for('my-symbol')");
   v8::Local<Value> sym2 = env->Global()->Get(v8_str("sym2"));
   CHECK(sym2->SameValue(glob));
   CHECK(!sym2->SameValue(glob_api));
 }
 
 
+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();
   v8::HandleScope scope(isolate);
 
   v8::Local<String> name = v8_str("my-private");
   v8::Local<v8::Private> glob = v8::Private::ForApi(isolate, name);
   v8::Local<v8::Object> obj = v8::Object::New(isolate);
   CHECK(obj->SetPrivate(glob, v8::Integer::New(isolate, 3)));
 
@@ skipping 19939 matching lines @@
   desc = x->GetOwnPropertyDescriptor(v8_str("p1"));
   Local<Function> set =
     Local<Function>::Cast(Local<Object>::Cast(desc)->Get(v8_str("set")));
   Local<Function> get =
     Local<Function>::Cast(Local<Object>::Cast(desc)->Get(v8_str("get")));
   CHECK_EQ(v8_num(13), get->Call(x, 0, NULL));
   Handle<Value> args[] = { v8_num(14) };
   set->Call(x, 1, args);
   CHECK_EQ(v8_num(14), get->Call(x, 0, NULL));
 }