CompositorWorkerProxyClientImpl to CompositorProxy cross thread reference is using WeakMember

third_party/WebKit/Source/web/AnimationWorkletProxyClientImpl.h

 // Copyright 2016 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 AnimationWorkletProxyClientImpl_h
 #define AnimationWorkletProxyClientImpl_h
 
 #include "core/dom/AnimationWorkletProxyClient.h"
 #include "platform/heap/Handle.h"
 #include "web/CompositorAnimator.h"
+#include "web/CompositorProxyClientImpl.h"
 #include "wtf/Noncopyable.h"
 
 namespace blink {
 
 class CompositorMutatorImpl;
 
 // Mediates between one Animator and the associated CompositorMutatorImpl. There
 // is one AnimationWorkletProxyClientImpl per Animator but there may be multiple
 // for a given mutator and animatorWorklet.
 //
 // This is constructed on the main thread but it is used in the worklet backing
 // thread i.e., compositor thread.
 class AnimationWorkletProxyClientImpl final
     : public AnimationWorkletProxyClient,
       public CompositorAnimator {
   WTF_MAKE_NONCOPYABLE(AnimationWorkletProxyClientImpl);
   USING_GARBAGE_COLLECTED_MIXIN(AnimationWorkletProxyClientImpl);
 
  public:
   explicit AnimationWorkletProxyClientImpl(CompositorMutatorImpl*);
   DECLARE_VIRTUAL_TRACE();
 
   // CompositorAnimator:
   // This method is invoked in compositor thread
   bool mutate(double monotonicTimeNow,
               CompositorMutableStateProvider*) override;
 
-  // CompositorProxyClient:
-  void registerCompositorProxy(CompositorProxy*) override;
-  void unregisterCompositorProxy(CompositorProxy*) override;
-
  private:
   CrossThreadPersistent<CompositorMutatorImpl> m_mutator;
-  HeapHashSet<WeakMember<CompositorProxy>> m_proxies;
+
+  CrossThreadPersistent<CompositorProxyClientImpl> m_compositorProxyClient;
 };
 
 }  // namespace blink
 
 #endif  // AnimationWorkletProxyClientImpl_h