Don't create redundant ThreadData for Worker Threads

base/tracked_objects.h

Index: base/tracked_objects.h
diff --git a/base/tracked_objects.h b/base/tracked_objects.h
index 168b17db045a429234c3ae403622a9217adf3ad8..7bf2cd0c6cfe66682e5c9df81cee05ea366bb2b4 100644
--- a/base/tracked_objects.h
+++ b/base/tracked_objects.h
@@ -452,7 +452,8 @@ class BASE_EXPORT ThreadData {
   // This is used by all threads that have names, and should be explicitly
   // set *before* any births on the threads have taken place.  It is generally
   // only used by the message loop, which has a well defined thread name.
-  static void InitializeThreadContext(const std::string& suggested_name);
+  static void InitializeThreadContext(const std::string& suggested_name,
+                                      bool is_worker_thread = false);
 
   // Using Thread Local Store, find the current instance for collecting data.
   // If an instance does not exist, construct one (and remember it for use on