Blink GC plugin: Require that fields are actually traced by the visitor and identify tracing of dep…

tools/clang/blink_gc_plugin/tests/trace_if_needed.cpp

Index: tools/clang/blink_gc_plugin/tests/trace_if_needed.cpp
diff --git a/tools/clang/blink_gc_plugin/tests/ignore_fields.cpp b/tools/clang/blink_gc_plugin/tests/trace_if_needed.cpp
similarity index 52%
copy from tools/clang/blink_gc_plugin/tests/ignore_fields.cpp
copy to tools/clang/blink_gc_plugin/tests/trace_if_needed.cpp
index 118af75424a6ec892fcd4c9bba743b5bb1ebec56..563c6cc125f46a0a3328c06b61ac2b0c744331a8 100644
--- a/tools/clang/blink_gc_plugin/tests/ignore_fields.cpp
+++ b/tools/clang/blink_gc_plugin/tests/trace_if_needed.cpp
@@ -2,14 +2,15 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "ignore_fields.h"
+#include "trace_if_needed.h"
 
 namespace blink {
 
-void C::trace(Visitor* visitor)
+template<typename T>
+void TemplatedObject<T>::trace(Visitor* visitor)
 {
-    // Missing trace of m_one.
-    // Not missing ignored field m_two.
+    TraceIfNeeded<T>::trace(visitor, &m_one);
+    // Missing trace of m_two
 }
 
 }