Blink GC plugin: Ensure that classes with virtual trace methods always have vtables for their left-…

tools/clang/blink_gc_plugin/tests/polymorphic_class_with_non_virtual_trace.h

Index: tools/clang/blink_gc_plugin/tests/polymorphic_class_with_non_virtual_trace.h
diff --git a/tools/clang/blink_gc_plugin/tests/polymorphic_class_with_non_virtual_trace.h b/tools/clang/blink_gc_plugin/tests/polymorphic_class_with_non_virtual_trace.h
new file mode 100644
index 0000000000000000000000000000000000000000..3396c94553f5219cb6073bd9b81ad2da03f30f01
--- /dev/null
+++ b/tools/clang/blink_gc_plugin/tests/polymorphic_class_with_non_virtual_trace.h
@@ -0,0 +1,46 @@
+// 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 POLYMORPHIC_CLASS_WITH_NON_VIRTUAL_TRACE_H_
+#define POLYMORPHIC_CLASS_WITH_NON_VIRTUAL_TRACE_H_
+
+#include "heap/stubs.h"
+
+namespace blink {
+
+class HeapObject : public GarbageCollected<HeapObject> {
+public:
+    void trace(Visitor*) { }
+};
+
+class NonPolymorphicBase {
+};
+
+class PolymorphicBase {
+public:
+    virtual void foo();
+};
+
+class IsLeftMostPolymorphic
+    : public GarbageCollected<IsLeftMostPolymorphic>,
+      public PolymorphicBase {
+public:
+    void trace(Visitor*);
+private:
+    Member<HeapObject> m_obj;
+};
+
+class IsNotLeftMostPolymorphic
+    : public GarbageCollected<IsNotLeftMostPolymorphic>,
+      public NonPolymorphicBase,
+      public PolymorphicBase {
+public:
+    void trace(Visitor*);
+private:
+    Member<HeapObject> m_obj;
+};
+
+}
+
+#endif