Prepare CompositorWorker for per thread heap

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

 // Copyright 2015 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 CompositorProxy_h
 #define CompositorProxy_h
 
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "core/CoreExport.h"
 #include "core/dom/CompositorProxyClient.h"
 #include "core/dom/DOMMatrix.h"
 #include "core/dom/Element.h"
 #include "platform/graphics/CompositorMutableState.h"
 #include "platform/heap/Handle.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 class DOMMatrix;
 class ExceptionState;
 class ExecutionContext;
 
 class CORE_EXPORT CompositorProxy final : public GarbageCollectedFinalized<CompositorProxy>, public ScriptWrappable {
     DEFINE_WRAPPERTYPEINFO();
 public:
     static CompositorProxy* create(ExecutionContext*, Element*, const Vector<String>& attributeArray, ExceptionState&);
     static CompositorProxy* create(ExecutionContext*, uint64_t element, uint32_t compositorMutableProperties);
     virtual ~CompositorProxy();
 
-    DEFINE_INLINE_TRACE()
-    {
-        visitor->trace(m_client);
-    }
+    DEFINE_INLINE_TRACE() { }
 
     uint64_t elementId() const { return m_elementId; }
     uint32_t compositorMutableProperties() const { return m_compositorMutableProperties; }
     bool supports(const String& attribute) const;
 
     bool initialized() const { return m_connected && m_state.get(); }
     bool connected() const { return m_connected; }
     void disconnect();
 
     double opacity(ExceptionState&) const;
@@ skipping 14 matching lines @@
     CompositorProxy(uint64_t element, uint32_t compositorMutableProperties, CompositorProxyClient*);
 
 private:
     bool raiseExceptionIfNotMutable(uint32_t compositorMutableProperty, ExceptionState&) const;
     void disconnectInternal();
 
     const uint64_t m_elementId = 0;
     const uint32_t m_compositorMutableProperties = 0;
 
     bool m_connected = true;
-    Member<CompositorProxyClient> m_client;
+    CrossThreadPersistent<CompositorProxyClient> m_client;
     std::unique_ptr<CompositorMutableState> m_state;
 };
 
 } // namespace blink
 
 #endif // CompositorProxy_h