Don't create redundant ThreadData for Worker Threads

base/threading/platform_thread_freebsd.cc

Index: base/threading/platform_thread_freebsd.cc
diff --git a/base/threading/platform_thread_freebsd.cc b/base/threading/platform_thread_freebsd.cc
index 44f14c873e015383ad8ac84445f82dccff4d47a7..3b7914fcf0b2e4c413e92dd91f23cfddb9add9c7 100644
--- a/base/threading/platform_thread_freebsd.cc
+++ b/base/threading/platform_thread_freebsd.cc
@@ -65,9 +65,10 @@ bool GetCurrentThreadPriorityForPlatform(ThreadPriority* priority) {
 }  // namespace internal
 
 // static
-void PlatformThread::SetName(const std::string& name) {
+void PlatformThread::SetName(const std::string& name, bool is_worker_thread) {
   ThreadIdNameManager::GetInstance()->SetName(CurrentId(), name);
-  tracked_objects::ThreadData::InitializeThreadContext(name);
+  if (!is_worker_thread)
+    tracked_objects::ThreadData::InitializeThreadContext(name);
 
 #if !defined(OS_NACL)
   // On FreeBSD we can get the thread names to show up in the debugger by