Revert of Pass per-frame task runners to Workers (when possible)

third_party/WebKit/Source/web/WebEmbeddedWorkerImpl.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 21 matching lines @@
 
 #include "bindings/core/v8/SourceLocation.h"
 #include "core/dom/CrossThreadTask.h"
 #include "core/dom/Document.h"
 #include "core/dom/SecurityContext.h"
 #include "core/fetch/SubstituteData.h"
 #include "core/frame/csp/ContentSecurityPolicy.h"
 #include "core/inspector/ConsoleMessage.h"
 #include "core/inspector/InspectorInstrumentation.h"
 #include "core/loader/FrameLoadRequest.h"
-#include "core/workers/ParentFrameTaskRunners.h"
 #include "core/workers/WorkerClients.h"
 #include "core/workers/WorkerGlobalScope.h"
 #include "core/workers/WorkerInspectorProxy.h"
 #include "core/workers/WorkerLoaderProxy.h"
 #include "core/workers/WorkerScriptLoader.h"
 #include "core/workers/WorkerThreadStartupData.h"
 #include "modules/serviceworkers/ServiceWorkerContainerClient.h"
 #include "modules/serviceworkers/ServiceWorkerThread.h"
 #include "platform/Histogram.h"
 #include "platform/SharedBuffer.h"
@@ skipping 196 matching lines @@
     m_mainFrame->frame()->document()->addConsoleMessage(ConsoleMessage::create(OtherMessageSource, webCoreMessageLevel, message.text, SourceLocation::create(message.url, message.lineNumber, message.columnNumber, nullptr)));
 }
 
 void WebEmbeddedWorkerImpl::postMessageToPageInspector(const String& message)
 {
     m_workerInspectorProxy->dispatchMessageFromWorker(message);
 }
 
 void WebEmbeddedWorkerImpl::postTaskToLoader(const WebTraceLocation& location, std::unique_ptr<ExecutionContextTask> task)
 {
-    // TODO(hiroshige,yuryu): Make this not use ExecutionContextTask and
-    // consider using m_mainThreadTaskRunners->getLoadingTaskRunner() instead.
     m_mainFrame->frame()->document()->postTask(location, std::move(task));
 }
 
 bool WebEmbeddedWorkerImpl::postTaskToWorkerGlobalScope(const WebTraceLocation& location, std::unique_ptr<ExecutionContextTask> task)
 {
     if (m_askedToTerminate || !m_workerThread)
         return false;
 
     m_workerThread->postTask(location, std::move(task));
     return !m_workerThread->terminated();
@@ skipping 161 matching lines @@
         m_mainScriptLoader->referrerPolicy(),
         starterOrigin,
         workerClients,
         m_mainScriptLoader->responseAddressSpace(),
         m_mainScriptLoader->originTrialTokens(),
         std::move(workerSettings),
         static_cast<V8CacheOptions>(m_workerStartData.v8CacheOptions));
 
     m_mainScriptLoader.clear();
 
-    // We have a dummy document here for loading but it doesn't really represent
-    // the document/frame of associated document(s) for this worker. Here we
-    // populate the task runners with null document not to confuse the frame
-    // scheduler (which will end up using the thread's default task runner).
-    m_mainThreadTaskRunners = ParentFrameTaskRunners::create(nullptr);
-
     m_workerGlobalScopeProxy = ServiceWorkerGlobalScopeProxy::create(*this, *document, *m_workerContextClient);
     m_loaderProxy = WorkerLoaderProxy::create(this);
     m_workerThread = ServiceWorkerThread::create(m_loaderProxy, *m_workerGlobalScopeProxy);
     m_workerThread->start(std::move(startupData));
     m_workerInspectorProxy->workerThreadCreated(document, m_workerThread.get(), scriptURL);
 }
 
 } // namespace blink