Revert of Remove WTF::isShutdown() (patchset #1 id:1 of https://codereview.chromium.org/2277663002/…

third_party/WebKit/Source/wtf/WTF.h

 /*
  * 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 23 matching lines @@
 #include "wtf/Compiler.h"
 #include "wtf/WTFExport.h"
 
 namespace WTF {
 
 typedef void MainThreadFunction(void*);
 
 // This function must be called exactly once from the main thread before using anything else in WTF.
 WTF_EXPORT void initialize(void (*)(MainThreadFunction, void*));
 WTF_EXPORT void shutdown();
+WTF_EXPORT bool isShutdown();
 WTF_EXPORT bool isMainThread();
 
 namespace internal {
 void callOnMainThread(MainThreadFunction*, void* context);
 } // namespace internal
 
 } // namespace WTF
 
 using WTF::isMainThread;
 
 #endif // WTF_h