Extract the SafeSearch client to a separate directory

chrome/browser/supervised_user/experimental/supervised_user_async_url_checker.h

-// Copyright 2014 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_SUPERVISED_USER_EXPERIMENTAL_SUPERVISED_USER_ASYNC_URL_CHECKER_H_
-#define CHROME_BROWSER_SUPERVISED_USER_EXPERIMENTAL_SUPERVISED_USER_ASYNC_URL_CHECKER_H_
-
-#include <stddef.h>
-
-#include "base/callback_forward.h"
-#include "base/containers/mru_cache.h"
-#include "base/macros.h"
-#include "base/memory/scoped_vector.h"
-#include "base/time/time.h"
-#include "chrome/browser/supervised_user/supervised_user_url_filter.h"
-#include "net/url_request/url_fetcher_delegate.h"
-#include "url/gurl.h"
-
-namespace net {
-class URLFetcher;
-class URLRequestContextGetter;
-}
-
-// This class checks against an online service (the SafeSearch API) whether a
-// given URL is safe to visit for a supervised user, and returns the result
-// asynchronously via a callback.
-class SupervisedUserAsyncURLChecker : net::URLFetcherDelegate {
- public:
-  // Returns whether |url| should be blocked. Called from CheckURL.
-  using CheckCallback =
-      base::Callback<void(const GURL&,
-                          SupervisedUserURLFilter::FilteringBehavior,
-                          bool /* uncertain */)>;
-
-  SupervisedUserAsyncURLChecker(net::URLRequestContextGetter* context);
-  SupervisedUserAsyncURLChecker(net::URLRequestContextGetter* context,
-                                size_t cache_size);
-  ~SupervisedUserAsyncURLChecker() override;
-
-  // Returns whether |callback| was run synchronously.
-  bool CheckURL(const GURL& url, const CheckCallback& callback);
-
-  void SetCacheTimeoutForTesting(const base::TimeDelta& timeout) {
-    cache_timeout_ = timeout;
-  }
-
- private:
-  struct Check;
-  struct CheckResult {
-    CheckResult(SupervisedUserURLFilter::FilteringBehavior behavior,
-                bool uncertain);
-    SupervisedUserURLFilter::FilteringBehavior behavior;
-    bool uncertain;
-    base::TimeTicks timestamp;
-  };
-
-  // net::URLFetcherDelegate implementation.
-  void OnURLFetchComplete(const net::URLFetcher* source) override;
-
-  net::URLRequestContextGetter* context_;
-
-  ScopedVector<Check> checks_in_progress_;
-
-  base::MRUCache<GURL, CheckResult> cache_;
-  base::TimeDelta cache_timeout_;
-
-  DISALLOW_COPY_AND_ASSIGN(SupervisedUserAsyncURLChecker);
-};
-
-#endif  // CHROME_BROWSER_SUPERVISED_USER_EXPERIMENTAL_SUPERVISED_USER_ASYNC_URL_CHECKER_H_