1persistent_no_trace.cpp:9:1: warning: [blink-gc] Class 'HeapObject' has untraced or not traceable fields.
2void HeapObject::Trace(Visitor* visitor) {
3^
4./persistent_no_trace.h:16:5: note: [blink-gc] Untraceable field 'm_crossThreadPersistent' declared here:
5    CrossThreadPersistent<HeapObject> m_crossThreadPersistent;
6    ^
7./persistent_no_trace.h:17:5: note: [blink-gc] Untraceable field 'm_crossThreadWeakPersistent' declared here:
8    CrossThreadWeakPersistent<HeapObject> m_crossThreadWeakPersistent;
9    ^
101 warning generated.
11