Add OSThread::GetCurrentThreadTraceId and use it in the timeline implementation

runtime/vm/os_thread_win.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "platform/globals.h"  // NOLINT
 #if defined(TARGET_OS_WINDOWS)
 
 #include "vm/os_thread.h"
 
 #include <process.h>  // NOLINT
@@ skipping 84 matching lines @@
   const int kStackSize = (128 * kWordSize * KB);
   return kStackSize;
 }
 
 
 ThreadId OSThread::GetCurrentThreadId() {
   return ::GetCurrentThreadId();
 }
 
 
+ThreadId OSThread::GetCurrentThreadTraceId() {
+  return ::GetCurrentThreadId();
+}
+
+
 ThreadJoinId OSThread::GetCurrentThreadJoinId() {
   return ::GetCurrentThreadId();
 }
 
 
 void OSThread::Join(ThreadJoinId id) {
   HANDLE handle = OpenThread(SYNCHRONIZE, false, id);
 
   // TODO(zra): OSThread::Start() closes the handle to the thread. Thus, by the
   // time we try to join the thread, its resources may have already been
@@ skipping 356 matching lines @@
   // timeout before we signal it, that object will get an extra
   // signal. This will be treated as a spurious wake-up and is OK
   // since all uses of monitors should recheck the condition after a
   // Wait.
   data_.SignalAndRemoveAllWaiters();
 }
 
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_WINDOWS)