Support ignorance of base class finalizers.

tools/clang/blink_gc_plugin/tests/class_requires_finalization_base.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 CLASS_REQUIRES_FINALIZATION_BASE_H_
 #define CLASS_REQUIRES_FINALIZATION_BASE_H_
 
 #include "heap/stubs.h"
 
 namespace WebCore {
@@ skipping 13 matching lines @@
 public:
     void trace(Visitor*);
 };
 
 // Base does not need finalization.
 class DoesNotNeedFinalizer : public A {
 public:
     void trace(Visitor*);
 };
 
+class GCedClassWithAScriptWrappableBase
+    : public A, public ScriptWrappable {
+public:
+    void trace(Visitor*);
+};
+
+class GCedClassWithAScriptWrappableAndAFinalizableBase
+    : public GCedClassWithAScriptWrappableBase
+    , public B
+    , public ScriptWrappable {
+public:
+    void trace(Visitor*);
+};
+
 }
 
 #endif