Check consistency of manual trace and finalization dispatching.

tools/clang/blink_gc_plugin/tests/virtual_and_trace_after_dispatch.h

 // 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.
 
-#ifndef BASE_REQUIRES_TRACING_H_
-#define BASE_REQUIRES_TRACING_H_
+#ifndef VIRTUAL_AND_TRACE_AFTER_DISPATCH_H_
+#define VIRTUAL_AND_TRACE_AFTER_DISPATCH_H_
 
 #include "heap/stubs.h"
 
 namespace WebCore {
 
 class A : public GarbageCollected<A> {
 public:
-    virtual void trace(Visitor*);
+    void trace(Visitor*);
+    void traceAfterDispatch(Visitor*);
+protected:
+    enum Type { TB };
+    A(Type type) : m_type(type) { }
+private:
+    Type m_type;
 };
 
 class B : public A {
-    // Does not need trace
-};
-
-class C : public B {
 public:
-    void trace(Visitor*);
+    B() : A(TB) { }
+    void traceAfterDispatch(Visitor*);
+    virtual void foo() { }
 private:
     Member<A> m_a;
 };
-
-class D : public C {
-public:
-    void trace(Visitor*);
-private:
-    Member<A> m_a;
-};
 
 }
 
 #endif