Worker: Introduce per-global-scope task scheduler

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 6726bb88fc5495779932c70d85a6eccc023439c9..38d705ee77ffc3dde08a14a00bb8e8e84b9fd36f 100644
--- a/third_party/WebKit/Source/web/WebSharedWorkerImpl.cpp
+++ b/third_party/WebKit/Source/web/WebSharedWorkerImpl.cpp
@@ -32,6 +32,7 @@
 
 #include <memory>
 #include "core/dom/Document.h"
+#include "core/dom/TaskRunnerHelper.h"
 #include "core/events/MessageEvent.h"
 #include "core/inspector/ConsoleMessage.h"
 #include "core/loader/FrameLoadRequest.h"
@@ -254,7 +255,8 @@ void WebSharedWorkerImpl::postTaskToWorkerGlobalScope(
     const WebTraceLocation& location,
     std::unique_ptr<WTF::CrossThreadClosure> task) {
   DCHECK(isMainThread());
-  m_workerThread->postTask(location, std::move(task));
+  TaskRunnerHelper::get(TaskType::Networking, m_workerThread.get())
+      ->postTask(location, std::move(task));
 }
 
 ThreadableLoadingContext* WebSharedWorkerImpl::getThreadableLoadingContext() {
@@ -268,11 +270,12 @@ ThreadableLoadingContext* WebSharedWorkerImpl::getThreadableLoadingContext() {
 void WebSharedWorkerImpl::connect(
     std::unique_ptr<WebMessagePortChannel> webChannel) {
   DCHECK(isMainThread());
-  workerThread()->postTask(
-      BLINK_FROM_HERE,
-      crossThreadBind(&WebSharedWorkerImpl::connectTaskOnWorkerThread,
-                      WTF::crossThreadUnretained(this),
-                      WTF::passed(std::move(webChannel))));
+  TaskRunnerHelper::get(TaskType::DOMManipulation, workerThread())
+      ->postTask(
+          BLINK_FROM_HERE,
+          crossThreadBind(&WebSharedWorkerImpl::connectTaskOnWorkerThread,
+                          WTF::crossThreadUnretained(this),
+                          WTF::passed(std::move(webChannel))));
 }
 
 void WebSharedWorkerImpl::connectTaskOnWorkerThread(