Move base to DEPS

base/threading/thread_checker_impl.h

-// Copyright (c) 2011 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_CHECKER_IMPL_H_
-#define BASE_THREADING_THREAD_CHECKER_IMPL_H_
-
-#include "base/base_export.h"
-#include "base/compiler_specific.h"
-#include "base/synchronization/lock.h"
-#include "base/threading/platform_thread.h"
-
-namespace base {
-
-// Real implementation of ThreadChecker, for use in debug mode, or
-// for temporary use in release mode (e.g. to CHECK on a threading issue
-// seen only in the wild).
-//
-// Note: You should almost always use the ThreadChecker class to get the
-// right version for your build configuration.
-class BASE_EXPORT ThreadCheckerImpl {
- public:
-  ThreadCheckerImpl();
-  ~ThreadCheckerImpl();
-
-  bool CalledOnValidThread() const WARN_UNUSED_RESULT;
-
-  // Changes the thread that is checked for in CalledOnValidThread.  This may
-  // be useful when an object may be created on one thread and then used
-  // exclusively on another thread.
-  void DetachFromThread();
-
- private:
-  void EnsureThreadIdAssigned() const;
-
-  mutable base::Lock lock_;
-  // This is mutable so that CalledOnValidThread can set it.
-  // It's guarded by |lock_|.
-  mutable PlatformThreadRef valid_thread_id_;
-};
-
-}  // namespace base
-
-#endif  // BASE_THREADING_THREAD_CHECKER_IMPL_H_