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

third_party/WebKit/Source/web/WebSharedWorkerImpl.cpp

 /*
  * Copyright (C) 2009 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 "core/dom/CrossThreadTask.h"
 #include "core/dom/Document.h"
 #include "core/events/MessageEvent.h"
 #include "core/html/HTMLFormElement.h"
 #include "core/inspector/ConsoleMessage.h"
 #include "core/inspector/InspectorInstrumentation.h"
 #include "core/loader/FrameLoadRequest.h"
 #include "core/loader/FrameLoader.h"
 #include "core/page/Page.h"
+#include "core/workers/ParentFrameTaskRunners.h"
 #include "core/workers/SharedWorkerGlobalScope.h"
 #include "core/workers/SharedWorkerThread.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 "platform/CrossThreadFunctional.h"
 #include "platform/RuntimeEnabledFeatures.h"
@@ skipping 212 matching lines @@
 {
     m_client->workerContextDestroyed();
     // The lifetime of this proxy is controlled by the worker context.
     delete this;
 }
 
 // WorkerLoaderProxyProvider -----------------------------------------------------------
 
 void WebSharedWorkerImpl::postTaskToLoader(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(BLINK_FROM_HERE, std::move(task));
 }
 
 bool WebSharedWorkerImpl::postTaskToWorkerGlobalScope(std::unique_ptr<ExecutionContextTask> task)
 {
     m_workerThread->postTask(BLINK_FROM_HERE, std::move(task));
     return true;
 }
 
 void WebSharedWorkerImpl::connect(WebMessagePortChannel* webChannel)
@@ skipping 60 matching lines @@
         m_mainScriptLoader->script(),
         nullptr,
         startMode,
         contentSecurityPolicy ? contentSecurityPolicy->headers().get() : nullptr,
         m_mainScriptLoader->referrerPolicy(),
         starterOrigin,
         workerClients,
         m_mainScriptLoader->responseAddressSpace(),
         m_mainScriptLoader->originTrialTokens(),
         std::move(workerSettings));
+
+    // 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_loaderProxy = WorkerLoaderProxy::create(this);
     m_workerThread = SharedWorkerThread::create(m_name, m_loaderProxy, *this);
     InspectorInstrumentation::scriptImported(m_loadingDocument.get(), m_mainScriptLoader->identifier(), m_mainScriptLoader->script());
     m_mainScriptLoader.clear();
 
     workerThread()->start(std::move(startupData));
     m_workerInspectorProxy->workerThreadCreated(toDocument(m_loadingDocument.get()), workerThread(), m_url);
     m_client->workerScriptLoaded();
 }
 
@@ skipping 37 matching lines @@
     if (devtoolsAgent)
         devtoolsAgent->dispatchOnInspectorBackend(sessionId, callId, method, message);
 }
 
 WebSharedWorker* WebSharedWorker::create(WebSharedWorkerClient* client)
 {
     return new WebSharedWorkerImpl(client);
 }
 
 } // namespace blink