CompositorWorkerProxyClientImpl to CompositorProxy cross thread reference is using WeakMember

third_party/WebKit/Source/core/dom/CompositorProxy.cpp

Index: third_party/WebKit/Source/core/dom/CompositorProxy.cpp
diff --git a/third_party/WebKit/Source/core/dom/CompositorProxy.cpp b/third_party/WebKit/Source/core/dom/CompositorProxy.cpp
index e715638b804f420fddba14fb52c421ec4cc444a1..b8aa2a2e3bc81d6d275d23a2e69c0bdf07f26dd4 100644
--- a/third_party/WebKit/Source/core/dom/CompositorProxy.cpp
+++ b/third_party/WebKit/Source/core/dom/CompositorProxy.cpp
@@ -126,7 +126,8 @@ CompositorProxy* CompositorProxy::create(ExecutionContext* context,
     DCHECK(clients);
     CompositorWorkerProxyClient* client =
         CompositorWorkerProxyClient::from(clients);
-    return new CompositorProxy(elementId, compositorMutableProperties, client);
+    return new CompositorProxy(elementId, compositorMutableProperties,
+                               client->compositorProxyClient());
   }
 
   return new CompositorProxy(elementId, compositorMutableProperties);
@@ -178,6 +179,10 @@ CompositorProxy::~CompositorProxy() {
   DCHECK(!m_connected);
 }
 
+DEFINE_TRACE(CompositorProxy) {
+  visitor->trace(m_client);
+}
+
 bool CompositorProxy::supports(const String& attributeName) const {
   return m_compositorMutableProperties &
          compositorMutablePropertyForName(attributeName);