| // Copyright 2014 The Chromium Authors. All rights reserved. | |
| // Use of this source code is governed by a BSD-style license that can be | |
| // found in the LICENSE file. | |
| #include "base_requires_tracing.h" | |
| namespace blink { | |
| void A::trace(Visitor* visitor) { } | |
| void C::trace(Visitor* visitor) { | |
| visitor->trace(m_a); | |
| // Missing B::trace(visitor) | |
| } | |
| void D::trace(Visitor* visitor) { | |
| visitor->trace(m_a); | |
| C::trace(visitor); | |
| } | |
| } |