[ios] Added web::test::SetUpHttpServer which takes ResponseProvider.

ios/web/public/test/http_server_util.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_HTTP_SERVER_UTIL_H_
 #define IOS_WEB_PUBLIC_TEST_HTTP_SERVER_UTIL_H_
 
 #include <map>
 
 #include "url/gurl.h"
 
 namespace web {
+
+class ResponseProvider;
+
 namespace test {
 
 // Sets up a web::test::HttpServer with a simple HtmlResponseProvider. The
 // HtmlResponseProvider will use the |responses| map to resolve URLs.
 void SetUpSimpleHttpServer(const std::map<GURL, std::string>& responses);
 
 // Sets up a web::test::HttpServer with a FileBasedResponseProvider. The
 // server will try to resolve URLs as file paths relative to the application
 // bundle path. web::test::MakeUrl should be used to rewrite URLs before doing
 // a request.
 void SetUpFileBasedHttpServer();
 
+// Sets up a web::test::HttpServer with a single custom provider.
+// Takes ownership of the provider.
+void SetUpHttpServer(std::unique_ptr<web::ResponseProvider> provider);
+
 }  // namespace test
 }  // namespace web
 
 #endif  // IOS_WEB_PUBLIC_TEST_HTTP_SERVER_UTIL_H_