[TimeZoneMonitor] Decouple renderer side impl from content to blink.

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

 /*
  * Copyright (C) 2008 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 135 matching lines @@
   // Thread owns the microtask runner; reference remains
   // valid for the lifetime of this object.
   WorkerThread* m_workerThread;
 };
 
 static Mutex& threadSetMutex() {
   DEFINE_THREAD_SAFE_STATIC_LOCAL(Mutex, mutex, new Mutex);
   return mutex;
 }
 
-static HashSet<WorkerThread*>& workerThreads() {
-  DEFINE_STATIC_LOCAL(HashSet<WorkerThread*>, threads, ());
-  return threads;
-}
-
 WorkerThreadLifecycleContext::WorkerThreadLifecycleContext() {
   DCHECK(isMainThread());
 }
 
 WorkerThreadLifecycleContext::~WorkerThreadLifecycleContext() {
   DCHECK(isMainThread());
 }
 
 void WorkerThreadLifecycleContext::notifyContextDestroyed() {
   DCHECK(isMainThread());
@@ skipping 142 matching lines @@
 WorkerInspectorController* WorkerThread::workerInspectorController() {
   DCHECK(isCurrentThread());
   return m_workerInspectorController.get();
 }
 
 unsigned WorkerThread::workerThreadCount() {
   MutexLocker lock(threadSetMutex());
   return workerThreads().size();
 }
 
+HashSet<WorkerThread*>& WorkerThread::workerThreads() {

[nhiroki, 2016/10/17 12:01:08]

DCHECK(isMainThread());

[leonhsl(Using Gerrit), 2016/10/18 10:03:52]

Done.

+  DEFINE_STATIC_LOCAL(HashSet<WorkerThread*>, threads, ());
+  return threads;
+}
+
 PlatformThreadId WorkerThread::platformThreadId() {
   if (!m_requestedToStart)
     return 0;
   return workerBackingThread().backingThread().platformThread().threadId();
 }
 
 bool WorkerThread::isForciblyTerminated() {
   MutexLocker lock(m_threadStateMutex);
   switch (m_exitCode) {
     case ExitCode::NotTerminated:
@@ skipping 352 matching lines @@
   MutexLocker lock(m_threadStateMutex);
   return m_requestedToTerminate;
 }
 
 ExitCode WorkerThread::getExitCodeForTesting() {
   MutexLocker lock(m_threadStateMutex);
   return m_exitCode;
 }
 
 }  // namespace blink