Reland of Worker: Introduce per-global-scope task scheduler

third_party/WebKit/Source/web/WebEmbeddedWorkerImpl.cpp

Index: third_party/WebKit/Source/web/WebEmbeddedWorkerImpl.cpp
diff --git a/third_party/WebKit/Source/web/WebEmbeddedWorkerImpl.cpp b/third_party/WebKit/Source/web/WebEmbeddedWorkerImpl.cpp
index 6acd6833d14aa1989cea9188bbb255a3c6f07ea9..54bc980e83fd65163630a613a2978d2b414e7a68 100644
--- a/third_party/WebKit/Source/web/WebEmbeddedWorkerImpl.cpp
+++ b/third_party/WebKit/Source/web/WebEmbeddedWorkerImpl.cpp
@@ -34,6 +34,7 @@
 #include "bindings/core/v8/SourceLocation.h"
 #include "core/dom/Document.h"
 #include "core/dom/SecurityContext.h"
+#include "core/dom/TaskRunnerHelper.h"
 #include "core/frame/csp/ContentSecurityPolicy.h"
 #include "core/inspector/ConsoleMessage.h"
 #include "core/loader/FrameLoadRequest.h"
@@ -274,7 +275,8 @@
     std::unique_ptr<WTF::CrossThreadClosure> task) {
   if (asked_to_terminate_ || !worker_thread_)
     return;
-  worker_thread_->PostTask(location, std::move(task));
+  TaskRunnerHelper::Get(TaskType::kNetworking, worker_thread_.get())
+      ->PostTask(location, std::move(task));
 }
 
 ThreadableLoadingContext* WebEmbeddedWorkerImpl::GetThreadableLoadingContext() {