diff -r 000000000000 -r 6474c204b198 security/sandbox/chromium/base/threading/thread_id_name_manager.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/security/sandbox/chromium/base/threading/thread_id_name_manager.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,67 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef BASE_THREADING_THREAD_ID_NAME_MANAGER_H_
+#define BASE_THREADING_THREAD_ID_NAME_MANAGER_H_
+
+#include <map>
+#include <string>
+
+#include "base/base_export.h"
+#include "base/basictypes.h"
+#include "base/synchronization/lock.h"
+#include "base/threading/platform_thread.h"
+
+template <typename T> struct DefaultSingletonTraits;
+
+namespace base {
+
+class BASE_EXPORT ThreadIdNameManager {
+ public:
+  static ThreadIdNameManager* GetInstance();
+
+  static const char* GetDefaultInternedString();
+
+  // Register the mapping between a thread |id| and |handle|.
+  void RegisterThread(PlatformThreadHandle::Handle handle, PlatformThreadId id);
+
+  // Set the name for the given id.
+  void SetName(PlatformThreadId id, const char* name);
+
+  // Get the name for the given id.
+  const char* GetName(PlatformThreadId id);
+
+  // Remove the name for the given id.
+  void RemoveName(PlatformThreadHandle::Handle handle, PlatformThreadId id);
+
+ private:
+  friend struct DefaultSingletonTraits<ThreadIdNameManager>;
+
+  typedef std::map<PlatformThreadId, PlatformThreadHandle::Handle>
+      ThreadIdToHandleMap;
+  typedef std::map<PlatformThreadHandle::Handle, std::string*>
+      ThreadHandleToInternedNameMap;
+  typedef std::map<std::string, std::string*> NameToInternedNameMap;
+
+  ThreadIdNameManager();
+  ~ThreadIdNameManager();
+
+  // lock_ protects the name_to_interned_name_, thread_id_to_handle_ and
+  // thread_handle_to_interned_name_ maps.
+  Lock lock_;
+
+  NameToInternedNameMap name_to_interned_name_;
+  ThreadIdToHandleMap thread_id_to_handle_;
+  ThreadHandleToInternedNameMap thread_handle_to_interned_name_;
+
+  // Treat the main process specially as there is no PlatformThreadHandle.
+  std::string* main_process_name_;
+  PlatformThreadId main_process_id_;
+
+  DISALLOW_COPY_AND_ASSIGN(ThreadIdNameManager);
+};
+
+}  // namespace base
+
+#endif  // BASE_THREADING_THREAD_ID_NAME_MANAGER_H_