1 // Copyright 2014 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4 
5 #ifndef BASE_REQUIRES_TRACING_H_
6 #define BASE_REQUIRES_TRACING_H_
7 
8 #include "heap/stubs.h"
9 
10 namespace blink {
11 
12 class A : public GarbageCollected<A> {
13 public:
14     virtual void trace(Visitor*);
15 };
16 
17 class B : public A {
18     // Does not need trace
19 };
20 
21 class C : public B {
22 public:
23     void trace(Visitor*);
24 private:
25     Member<A> m_a;
26 };
27 
28 class D : public C {
29 public:
30     void trace(Visitor*);
31 private:
32     Member<A> m_a;
33 };
34 
35 }
36 
37 #endif
38