WTF: Initialize main-thread stack estimates when WTF starts up.

third_party/WebKit/Source/wtf/ThreadingWin.cpp

Index: third_party/WebKit/Source/wtf/ThreadingWin.cpp
diff --git a/third_party/WebKit/Source/wtf/ThreadingWin.cpp b/third_party/WebKit/Source/wtf/ThreadingWin.cpp
index 44c81a573568b4c0ebd6952dc44647241e39ae66..2c94dd3d9e95e0731a88b58d37d2456b8d3ea61a 100644
--- a/third_party/WebKit/Source/wtf/ThreadingWin.cpp
+++ b/third_party/WebKit/Source/wtf/ThreadingWin.cpp
@@ -143,8 +143,24 @@ void initializeThreading() {
   double_conversion::DoubleToStringConverter::EcmaScriptConverter();
 }
 
+namespace {
+ThreadSpecificKey s_currentThreadKey;
+}  // namespace
+
+void initializeCurrentThread() {
+  threadSpecificKeyCreate(&s_currentThreadKey, [](void*) {});
+}
+
 ThreadIdentifier currentThread() {
-  return wtfThreadData().threadId();
+  static_assert(sizeof(ThreadIdentifier) <= sizeof(void*),
+                "ThreadIdentifier must fit in a void*.");
+  void* value = threadSpecificGet(s_currentThreadKey);
+  if (UNLIKELY(!value)) {
+    value = reinterpret_cast<void*>(internal::currentThreadSyscall());
+    DCHECK(value);
+    threadSpecificSet(s_currentThreadKey, value);
+  }
+  return reinterpret_cast<intptr_t>(threadSpecificGet(s_currentThreadKey));
 }
 
 MutexBase::MutexBase(bool recursive) {