Don't create redundant ThreadData for Worker Threads

base/threading/platform_thread_linux.cc

Index: base/threading/platform_thread_linux.cc
diff --git a/base/threading/platform_thread_linux.cc b/base/threading/platform_thread_linux.cc
index 95ed32418ff49bdce1cfc91b846374000f62a4e3..053a2b813a8e30da6623b28f178289f488e788bb 100644
--- a/base/threading/platform_thread_linux.cc
+++ b/base/threading/platform_thread_linux.cc
@@ -66,9 +66,10 @@ 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);
+  tracked_objects::ThreadData::InitializeThreadContext(name, is_worker_thread);
 
 #if !defined(OS_NACL)
   // On linux we can get the thread names to show up in the debugger by setting