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 2896 matching lines @@
   v8::Local<String> name = v8_str("my-symbol");
   v8::Local<v8::Symbol> glob = v8::Symbol::For(isolate, name);
   v8::Local<v8::Symbol> glob2 = v8::Symbol::For(isolate, name);
   CHECK(glob2->SameValue(glob));
 
   v8::Local<v8::Symbol> glob_api = v8::Symbol::ForApi(isolate, name);
   v8::Local<v8::Symbol> glob_api2 = v8::Symbol::ForApi(isolate, name);
   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));
 
   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));
+
+  CompileRun("var sym3 = Symbol.iterator");
+  v8::Local<Value> sym3 = env->Global()->Get(v8_str("sym3"));
+  CHECK(!sym3.IsEmpty());
+  CHECK(sym3->SameValue(iterator));
 }
 
 
 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);
@@ skipping 19942 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));
 }