Worklet: Enqueue tasks into outsideSetting's event loop

third_party/WebKit/Source/core/workers/ThreadedWorklet.cpp

 // Copyright 2017 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/workers/ThreadedWorklet.h"
 
 #include "bindings/core/v8/ScriptSourceCode.h"
 #include "bindings/core/v8/V8BindingForCore.h"
 #include "core/dom/DOMException.h"
 #include "core/dom/Document.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/frame/LocalFrame.h"
 #include "core/workers/WorkletGlobalScopeProxy.h"
 #include "platform/wtf/WTF.h"
 
 namespace blink {
 
-ThreadedWorklet::ThreadedWorklet(LocalFrame* frame)
-    : Worklet(frame), frame_(frame) {}
+ThreadedWorklet::ThreadedWorklet(LocalFrame* frame) : Worklet(frame) {}
 
 void ThreadedWorklet::FetchAndInvokeScript(const KURL& module_url_record,
                                            const WorkletOptions&,
                                            ScriptPromiseResolver* resolver) {
   DCHECK(IsMainThread());
   if (!GetExecutionContext())
     return;
 
   if (!IsInitialized())
     Initialize();
 
-  WorkletScriptLoader* script_loader =
-      WorkletScriptLoader::Create(frame_->GetDocument()->Fetcher(), this);
+  WorkletScriptLoader* script_loader = WorkletScriptLoader::Create(
+      ToDocument(GetExecutionContext())->Fetcher(), this);
   loader_to_resolver_map_.Set(script_loader, resolver);
   script_loader->FetchScript(module_url_record);
 }
 
 void ThreadedWorklet::NotifyWorkletScriptLoadingFinished(
     WorkletScriptLoader* script_loader,
     const ScriptSourceCode& source_code) {
   DCHECK(IsMainThread());
   ScriptPromiseResolver* resolver = loader_to_resolver_map_.at(script_loader);
   loader_to_resolver_map_.erase(script_loader);
 
   if (!script_loader->WasScriptLoadSuccessful()) {
     resolver->Reject(DOMException::Create(kNetworkError));
     return;
   }
 
   GetWorkletGlobalScopeProxy()->EvaluateScript(source_code);
   resolver->Resolve();
 }
 
 void ThreadedWorklet::ContextDestroyed(ExecutionContext* execution_context) {
   DCHECK(IsMainThread());
   for (const auto& script_loader : loader_to_resolver_map_.Keys())
     script_loader->Cancel();
   loader_to_resolver_map_.clear();
   if (IsInitialized())
     GetWorkletGlobalScopeProxy()->TerminateWorkletGlobalScope();
-  frame_ = nullptr;
 }
 
 DEFINE_TRACE(ThreadedWorklet) {
-  visitor->Trace(frame_);
   visitor->Trace(loader_to_resolver_map_);
   Worklet::Trace(visitor);
 }
 
 }  // namespace blink