[animation-worklet] invoke animate callback on mutation signal

third_party/WebKit/Source/modules/compositorworker/AnimationWorkletThread.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/AnimationWorkletThread.h"
 
 #include "core/workers/WorkerThreadStartupData.h"
 #include "modules/compositorworker/AnimationWorkletGlobalScope.h"
 #include "platform/instrumentation/tracing/TraceEvent.h"
 #include "platform/weborigin/SecurityOrigin.h"
@@ skipping 23 matching lines @@
     std::unique_ptr<WorkerThreadStartupData> startup_data) {
   TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("animation-worklet"),
                "AnimationWorkletThread::createWorkerGlobalScope");
 
   RefPtr<SecurityOrigin> security_origin =
       SecurityOrigin::Create(startup_data->script_url_);
   if (startup_data->starter_origin_privilege_data_)
     security_origin->TransferPrivilegesFrom(
         std::move(startup_data->starter_origin_privilege_data_));
 
-  // TODO(ikilpatrick): The AnimationWorkletGlobalScope will need to store a
-  // WorkerClients object for using a CompositorWorkerProxyClient object.
   return AnimationWorkletGlobalScope::Create(
       startup_data->script_url_, startup_data->user_agent_,
-      security_origin.Release(), this->GetIsolate(), this);
+      security_origin.Release(), this->GetIsolate(), this,
+      startup_data->worker_clients_);
 }
 
 }  // namespace blink