Move base to DEPS

base/sequence_checker.h

-// 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_SEQUENCE_CHECKER_H_
-#define BASE_SEQUENCE_CHECKER_H_
-
-// See comments for the similar block in thread_checker.h.
-#if (!defined(NDEBUG) || defined(DCHECK_ALWAYS_ON))
-#define ENABLE_SEQUENCE_CHECKER 1
-#else
-#define ENABLE_SEQUENCE_CHECKER 0
-#endif
-
-#include "base/sequence_checker_impl.h"
-
-namespace base {
-
-// Do nothing implementation, for use in release mode.
-//
-// Note: You should almost always use the SequenceChecker class to get
-// the right version for your build configuration.
-class SequenceCheckerDoNothing {
- public:
-  bool CalledOnValidSequencedThread() const {
-    return true;
-  }
-
-  void DetachFromSequence() {}
-};
-
-// SequenceChecker is a helper class used to help verify that some
-// methods of a class are called in sequence -- that is, called from
-// the same SequencedTaskRunner. It is a generalization of
-// ThreadChecker; see comments in sequence_checker_impl.h for details.
-//
-// Example:
-// class MyClass {
-//  public:
-//   void Foo() {
-//     DCHECK(sequence_checker_.CalledOnValidSequencedThread());
-//     ... (do stuff) ...
-//   }
-//
-//  private:
-//   SequenceChecker sequence_checker_;
-// }
-//
-// In Release mode, CalledOnValidSequencedThread() will always return true.
-#if ENABLE_SEQUENCE_CHECKER
-class SequenceChecker : public SequenceCheckerImpl {
-};
-#else
-class SequenceChecker : public SequenceCheckerDoNothing {
-};
-#endif  // ENABLE_SEQUENCE_CHECKER
-
-#undef ENABLE_SEQUENCE_CHECKER
-
-}  // namespace base
-
-#endif  // BASE_SEQUENCE_CHECKER_H_