Disallow Atomics.wait in ServiceWorker, allow in SharedWorker

third_party/WebKit/Source/web/WebSharedWorkerImpl.cpp

Index: third_party/WebKit/Source/web/WebSharedWorkerImpl.cpp
diff --git a/third_party/WebKit/Source/web/WebSharedWorkerImpl.cpp b/third_party/WebKit/Source/web/WebSharedWorkerImpl.cpp
index df1c855549616284cc81191861fa9a16353e306a..44a3c9a5a037bdec00abda52d3d23bf995a76a91 100644
--- a/third_party/WebKit/Source/web/WebSharedWorkerImpl.cpp
+++ b/third_party/WebKit/Source/web/WebSharedWorkerImpl.cpp
@@ -333,6 +333,9 @@ void WebSharedWorkerImpl::OnScriptLoaderFinished() {
       worker_inspector_proxy_->WorkerStartMode(document);
   std::unique_ptr<WorkerSettings> worker_settings =
       WTF::WrapUnique(new WorkerSettings(document->GetSettings()));
+  WorkerV8Settings worker_v8_settings = WorkerV8Settings::Default();
+  worker_v8_settings.atomics_wait_mode_ =
+      WorkerV8Settings::AtomicsWaitMode::kAllow;
   std::unique_ptr<WorkerThreadStartupData> startup_data =
       WorkerThreadStartupData::Create(
           url_, loading_document_->UserAgent(),
@@ -342,7 +345,7 @@ void WebSharedWorkerImpl::OnScriptLoaderFinished() {
           main_script_loader_->GetReferrerPolicy(), starter_origin,
           worker_clients, main_script_loader_->ResponseAddressSpace(),
           main_script_loader_->OriginTrialTokens(), std::move(worker_settings),
-          WorkerV8Settings::Default());
+          worker_v8_settings);
 
   // SharedWorker can sometimes run tasks that are initiated by/associated with
   // a document's frame but these documents can be from a different process. So