Split up ios/web:test_support.

ios/web/public/test/response_providers/delayed_response_provider.h

-// Copyright 2016 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 IOS_WEB_PUBLIC_TEST_RESPONSE_PROVIDERS_DELAYED_RESPONSE_PROVIDER_H_
-#define IOS_WEB_PUBLIC_TEST_RESPONSE_PROVIDERS_DELAYED_RESPONSE_PROVIDER_H_
-
-#include <memory>
-
-#import "ios/web/public/test/response_providers/response_provider.h"
-
-namespace web {
-
-// A Response provider that delays the response provided by another reponse
-// provider
-class DelayedResponseProvider : public ResponseProvider {
- public:
-  // Creates a DelayedResponseProvider that delays the response from
-  // |delayed_provider| by |delay| seconds.
-  DelayedResponseProvider(
-      std::unique_ptr<web::ResponseProvider> delayed_provider,
-      double delay);
-  ~DelayedResponseProvider() override;
-
-  // Forwards to |delayed_provider_|.
-  bool CanHandleRequest(const Request& request) override;
-
-  // Creates a GCDWebServerResponse that will proxy the object returned by
-  // Forwards to |delayed_provider_->GetGCDWebServerResponse(request)|.
-  // The read operation will be delayed by |delay_| seconds.
-  GCDWebServerResponse* GetGCDWebServerResponse(
-      const Request& request) override;
-
- private:
-  std::unique_ptr<web::ResponseProvider> delayed_provider_;
-  double delay_;
-
-  DISALLOW_COPY_AND_ASSIGN(DelayedResponseProvider);
-};
-
-}  // namespace web
-
-#endif  // IOS_WEB_PUBLIC_TEST_RESPONSE_PROVIDERS_DELAYED_RESPONSE_PROVIDER_H_