Use TLS storage for thread ids in wtf/ThreadingPThreads

third_party/WebKit/Source/wtf/WTFThreadData.h

Index: third_party/WebKit/Source/wtf/WTFThreadData.h
diff --git a/third_party/WebKit/Source/wtf/WTFThreadData.h b/third_party/WebKit/Source/wtf/WTFThreadData.h
index 7d9d991f657efc662ec8ff72a4c23c385e99c2e3..0717936d211af8be44ab1eda0b8a09e05dde4f0d 100644
--- a/third_party/WebKit/Source/wtf/WTFThreadData.h
+++ b/third_party/WebKit/Source/wtf/WTFThreadData.h
@@ -53,10 +53,14 @@ class WTF_EXPORT WTFThreadData {
 
   ICUConverterWrapper& cachedConverterICU() { return *m_cachedConverterICU; }
 
+  ThreadIdentifier threadId() { return m_threadId; }

[esprehn, 2017/01/12 19:38:49]

const

[Charlie Harrison, 2017/01/12 19:44:33]

Done.

+
  private:
   std::unique_ptr<AtomicStringTable> m_atomicStringTable;
   std::unique_ptr<ICUConverterWrapper> m_cachedConverterICU;
 
+  ThreadIdentifier m_threadId;
+
   static ThreadSpecific<WTFThreadData>* staticData;
   friend WTFThreadData& wtfThreadData();
 };