[animation-worklet] invoke animate callback on mutation signal

third_party/WebKit/Source/modules/compositorworker/AnimationWorklet.cpp

 // 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.
 
 #include "modules/compositorworker/AnimationWorklet.h"
 
 #include "bindings/core/v8/V8BindingForCore.h"
 #include "core/dom/AnimationWorkletProxyClient.h"
 #include "core/dom/Document.h"
 #include "core/frame/LocalFrame.h"
@@ skipping 19 matching lines @@
 void AnimationWorklet::Initialize() {
   AnimationWorkletThread::EnsureSharedBackingThread();
 
   DCHECK(!worklet_messaging_proxy_);
   DCHECK(GetExecutionContext());
   Document* document = ToDocument(GetExecutionContext());
   AnimationWorkletProxyClient* proxy_client =
       document->GetFrame()->GetChromeClient().CreateAnimationWorkletProxyClient(
           document->GetFrame());
 
+  WorkerClients* worker_clients = WorkerClients::Create();
+  ProvideAnimationWorkletProxyClientTo(worker_clients, proxy_client);
+
   worklet_messaging_proxy_ =
-      new AnimationWorkletMessagingProxy(GetExecutionContext(), proxy_client);
+      new AnimationWorkletMessagingProxy(GetExecutionContext(), worker_clients);
   worklet_messaging_proxy_->Initialize();
 }
 
 bool AnimationWorklet::IsInitialized() const {
   return worklet_messaging_proxy_;
 }
 
 WorkletGlobalScopeProxy* AnimationWorklet::GetWorkletGlobalScopeProxy() const {
   DCHECK(worklet_messaging_proxy_);
   return worklet_messaging_proxy_;
 }
 
 DEFINE_TRACE(AnimationWorklet) {
   ThreadedWorklet::Trace(visitor);
 }
 
 }  // namespace blink