Introduce a new phantom weakness type without finalization callback.

test/cctest/test-global-handles.cc

 // Copyright 2013 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 432 matching lines @@
   }
 
   CcTest::i_isolate()->heap()->CollectAllAvailableGarbage();
 
   CHECK(!g.IsEmpty());
   v8::HandleScope scope(isolate);
   v8::Local<v8::Object> o = v8::Local<v8::Object>::New(isolate, g);
   CHECK_EQ(identity, o->GetIdentityHash());
   CHECK(o->Has(isolate->GetCurrentContext(), v8_str("finalizer")).FromJust());
 }
+
+TEST(PhatomHandlesWithoutCallbacks) {
+  CcTest::InitializeVM();
+  v8::Isolate* isolate = CcTest::isolate();
+
+  v8::Global<v8::Object> g1, g2;
+  {
+    v8::HandleScope scope(isolate);
+    g1.Reset(isolate, v8::Object::New(isolate));
+    g1.SetWeak();
+    g2.Reset(isolate, v8::Object::New(isolate));
+    g2.SetWeak();
+  }
+
+  CHECK_EQ(0, isolate->NumberOfPhantomHandleResetsSinceLastCall());
+  CcTest::i_isolate()->heap()->CollectAllAvailableGarbage();
+  CHECK_EQ(2, isolate->NumberOfPhantomHandleResetsSinceLastCall());
+  CHECK_EQ(0, isolate->NumberOfPhantomHandleResetsSinceLastCall());
+}