Fast path for ThreadSpecific for main thread on TLS-slow platforms

third_party/WebKit/Source/wtf/ThreadingWin.cpp

 /*
  * Copyright (C) 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile, 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
@@ skipping 143 matching lines @@
   StringImpl::empty16Bit();
   atomicallyInitializedStaticMutex = new Mutex;
   wtfThreadData();
   initializeDates();
   // Force initialization of static DoubleToStringConverter converter variable
   // inside EcmaScriptConverter function while we are in single thread mode.
   double_conversion::DoubleToStringConverter::EcmaScriptConverter();
 }
 
 ThreadIdentifier currentThread() {
-  return internal::currentThreadSyscall();
+  return wtfThreadData().threadId();
 }
 
 MutexBase::MutexBase(bool recursive) {
   m_mutex.m_recursionCount = 0;
   InitializeCriticalSection(&m_mutex.m_internalMutex);
 }
 
 MutexBase::~MutexBase() {
   DeleteCriticalSection(&m_mutex.m_internalMutex);
 }
@@ skipping 235 matching lines @@
 }
 
 void willCreateThread() {
   s_threadCreated = true;
 }
 #endif
 
 }  // namespace WTF
 
 #endif  // OS(WIN)