Implement simple http server with set cookie functionality.

ios/web/public/test/response_providers/html_response_provider.mm

 // 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.
 
 #include "ios/web/public/test/response_providers/html_response_provider.h"
 
 #include "ios/web/public/test/response_providers/response_provider.h"
 #include "url/gurl.h"
 
 HtmlResponseProvider::HtmlResponseProvider()
     : response_provider_impl_(new HtmlResponseProviderImpl()) {}
 
 HtmlResponseProvider::HtmlResponseProvider(
     const std::map<GURL, std::string>& responses)
     : response_provider_impl_(new HtmlResponseProviderImpl(responses)) {}
 
 HtmlResponseProvider::HtmlResponseProvider(
+    const std::map<GURL, std::string>& responses,
+    const std::string& cookie)
+    : response_provider_impl_(new HtmlResponseProviderImpl(responses, cookie)) {
+}
+
+HtmlResponseProvider::HtmlResponseProvider(
     const std::map<GURL, HtmlResponseProviderImpl::Response>& responses)
     : response_provider_impl_(new HtmlResponseProviderImpl(responses)) {}
 
 HtmlResponseProvider::~HtmlResponseProvider() {}
 
 bool HtmlResponseProvider::CanHandleRequest(
     const web::ResponseProvider::Request& request) {
   return response_provider_impl_->CanHandleRequest(request);
 }
 
 void HtmlResponseProvider::GetResponseHeadersAndBody(
     const Request& request,
     scoped_refptr<net::HttpResponseHeaders>* headers,
     std::string* response_body) {
   response_provider_impl_->GetResponseHeadersAndBody(request, headers,
                                                      response_body);
 }