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

tools/clang/blink_gc_plugin/tests/base_class_must_define_virtual_trace.cpp

Index: tools/clang/blink_gc_plugin/tests/base_class_must_define_virtual_trace.cpp
diff --git a/tools/clang/blink_gc_plugin/tests/non_virtual_trace.cpp b/tools/clang/blink_gc_plugin/tests/base_class_must_define_virtual_trace.cpp
similarity index 54%
copy from tools/clang/blink_gc_plugin/tests/non_virtual_trace.cpp
copy to tools/clang/blink_gc_plugin/tests/base_class_must_define_virtual_trace.cpp
index 1f6a8b546df1b469f2c558d3f54f05b7ee96ebb5..cd38ec90fa96e20bc7ad52b3ca07f688e8a1a215 100644
--- a/tools/clang/blink_gc_plugin/tests/non_virtual_trace.cpp
+++ b/tools/clang/blink_gc_plugin/tests/base_class_must_define_virtual_trace.cpp
@@ -2,17 +2,18 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "non_virtual_trace.h"
+#include "base_class_must_define_virtual_trace.h"
 
 namespace blink {
 
-void A::trace(Visitor* visitor)
+void PartDerived::trace(Visitor* visitor)
 {
 }
 
-void C::trace(Visitor* visitor)
+void HeapDerived::trace(Visitor* visitor)
 {
-    B::trace(visitor);
+    visitor->trace(m_part);
 }
 
+
 }