Disallow cross-thread Persistent<> read access.

third_party/WebKit/Source/core/workers/ThreadedMessagingProxyBase.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/workers/ThreadedMessagingProxyBase.h"
 
 #include "bindings/core/v8/SourceLocation.h"
 #include "core/dom/Document.h"
 #include "core/dom/ExecutionContextTask.h"
 #include "core/frame/Deprecation.h"
 #include "core/loader/DocumentLoader.h"
-#include "core/workers/ParentFrameTaskRunners.h"
 #include "core/workers/WorkerInspectorProxy.h"
 #include "core/workers/WorkerThreadStartupData.h"
 #include "wtf/CurrentTime.h"
 
 namespace blink {
 
 namespace {
 
 static int s_liveMessagingProxyCount = 0;
 
@@ skipping 45 matching lines @@
     return;
 
   DCHECK(m_workerThread);
   m_workerThread->postTask(location, std::move(task));
 }
 
 void ThreadedMessagingProxyBase::postTaskToLoader(
     const WebTraceLocation& location,
     std::unique_ptr<ExecutionContextTask> task) {
   DCHECK(getExecutionContext()->isDocument());
-  m_parentFrameTaskRunners->get(TaskType::Networking)
+  getParentFrameTaskRunners()
+      ->get(TaskType::Networking)
       ->postTask(BLINK_FROM_HERE,
                  crossThreadBind(
                      &ExecutionContextTask::performTaskIfContextIsValid,
                      WTF::passed(std::move(task)),
                      wrapCrossThreadWeakPersistent(getExecutionContext())));
 }
 
 void ThreadedMessagingProxyBase::countFeature(UseCounter::Feature feature) {
   DCHECK(isParentContextThread());
   UseCounter::count(m_executionContext, feature);
@@ skipping 19 matching lines @@
 
 void ThreadedMessagingProxyBase::workerThreadCreated() {
   DCHECK(isParentContextThread());
   DCHECK(!m_askedToTerminate);
   DCHECK(m_workerThread);
 }
 
 void ThreadedMessagingProxyBase::parentObjectDestroyed() {
   DCHECK(isParentContextThread());
 
-  m_parentFrameTaskRunners->get(TaskType::UnspecedTimer)
+  getParentFrameTaskRunners()
+      ->get(TaskType::UnspecedTimer)
       ->postTask(
           BLINK_FROM_HERE,
           WTF::bind(&ThreadedMessagingProxyBase::parentObjectDestroyedInternal,
                     WTF::unretained(this)));
 }
 
 void ThreadedMessagingProxyBase::parentObjectDestroyedInternal() {
   DCHECK(isParentContextThread());
   m_mayBeDestroyed = true;
   if (m_workerThread)
@@ skipping 36 matching lines @@
 }
 
 bool ThreadedMessagingProxyBase::isParentContextThread() const {
   // TODO(nhiroki): Nested worker is not supported yet, so the parent context
   // thread should be equal to the main thread (http://crbug.com/31666).
   DCHECK(getExecutionContext()->isDocument());
   return isMainThread();
 }
 
 }  // namespace blink