Split up chrome/browser/policy subdirectory

chrome/browser/policy/rate_limiter.h

-// Copyright (c) 2013 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 CHROME_BROWSER_POLICY_RATE_LIMITER_H_
-#define CHROME_BROWSER_POLICY_RATE_LIMITER_H_
-
-#include <queue>
-
-#include "base/basictypes.h"
-#include "base/callback.h"
-#include "base/cancelable_callback.h"
-#include "base/memory/ref_counted.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/threading/non_thread_safe.h"
-#include "base/time.h"
-
-namespace base {
-class SequencedTaskRunner;
-class TickClock;
-}
-
-namespace policy {
-
-// A simple class to limit the rate at which a callback is invoked.
-class RateLimiter : public base::NonThreadSafe {
- public:
-  // Will limit invocations of |callback| to |max_requests| per |duration|.
-  // |task_runner| is used to post delayed tasks, and |clock| is used to
-  // measure elapsed time.
-  RateLimiter(size_t max_requests,
-              const base::TimeDelta& duration,
-              const base::Closure& callback,
-              scoped_refptr<base::SequencedTaskRunner> task_runner,
-              scoped_ptr<base::TickClock> clock);
-  ~RateLimiter();
-
-  // Posts a request to invoke |callback_|. It is invoked immediately if the
-  // rate in the preceding |duration_| period is within the limit, otherwise
-  // the callback will be invoked later, ensuring the allowed rate is not
-  // exceeded.
-  void PostRequest();
-
- private:
-  const size_t max_requests_;
-  const base::TimeDelta duration_;
-  base::Closure callback_;
-  scoped_refptr<base::SequencedTaskRunner> task_runner_;
-  scoped_ptr<base::TickClock> clock_;
-
-  std::queue<base::TimeTicks> invocation_times_;
-  base::CancelableClosure delayed_callback_;
-
-  DISALLOW_COPY_AND_ASSIGN(RateLimiter);
-};
-
-}  // namespace policy
-
-#endif  // CHROME_BROWSER_POLICY_RATE_LIMITER_H_