Introduce AnimationWorkletProxyClient and necessary plumbing to get it in worklet messaging proxy.

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

 // 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.
 
 #include "core/dom/CompositorProxy.h"
 
 #include "bindings/core/v8/ExceptionMessages.h"
 #include "bindings/core/v8/ExceptionState.h"
+#include "core/dom/CompositorWorkerProxyClient.h"
 #include "core/dom/DOMNodeIds.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/dom/ExecutionContext.h"
 #include "core/workers/WorkerClients.h"
 #include "core/workers/WorkerGlobalScope.h"
 #include "platform/CrossThreadFunctional.h"
 #include "platform/graphics/CompositorMutableProperties.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebTraceLocation.h"
 #include <algorithm>
@@ skipping 97 matching lines @@
 
   return new CompositorProxy(*element, attributeArray);
 }
 
 CompositorProxy* CompositorProxy::create(ExecutionContext* context,
                                          uint64_t elementId,
                                          uint32_t compositorMutableProperties) {
   if (context->isCompositorWorkerGlobalScope()) {
     WorkerClients* clients = toWorkerGlobalScope(context)->clients();
     DCHECK(clients);
-    CompositorProxyClient* client = CompositorProxyClient::from(clients);
+    CompositorWorkerProxyClient* client =
+        CompositorWorkerProxyClient::from(clients);
     return new CompositorProxy(elementId, compositorMutableProperties, client);
   }
 
   return new CompositorProxy(elementId, compositorMutableProperties);
 }
 
 CompositorProxy::CompositorProxy(uint64_t elementId,
                                  uint32_t compositorMutableProperties)
     : m_elementId(elementId),
       m_compositorMutableProperties(compositorMutableProperties),
@@ skipping 160 matching lines @@
         m_elementId, m_compositorMutableProperties);
   } else {
     Platform::current()->mainThread()->getWebTaskRunner()->postTask(
         BLINK_FROM_HERE,
         crossThreadBind(&decrementCompositorProxiedPropertiesForElement,
                         m_elementId, m_compositorMutableProperties));
   }
 }
 
 }  // namespace blink