v8::Private::ForApi should be context-independent.

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 bbf2f98875b417ecf2dcf0f2a605f0c6de26caef..96ee17e964cdb0fda1a01ce5a41d3dd87955e989 100644
--- a/test/cctest/test-api.cc
+++ b/test/cctest/test-api.cc
@@ -3325,6 +3325,20 @@ THREADED_TEST(GlobalSymbols) {
   CHECK(!sym2->SameValue(glob_api));
 }
 
+THREADED_TEST(GlobalSymbolsNoContext) {
+  v8::Isolate* isolate = CcTest::isolate();
+  v8::HandleScope scope(isolate);
+
+  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));
+}
 
 static void CheckWellKnownSymbol(v8::Local<v8::Symbol>(*getter)(v8::Isolate*),
                                  const char* name) {