Implement simple http server with set cookie functionality.

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

 // 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.
 
 #include "ios/web/public/test/response_providers/response_provider.h"
 
 #include "base/strings/stringprintf.h"
 #include "net/http/http_response_headers.h"
 
 namespace web {
@@ skipping 33 matching lines @@
 }
 
 // static
 scoped_refptr<net::HttpResponseHeaders>
 ResponseProvider::GetDefaultResponseHeaders() {
   return GetResponseHeaders("text/html", net::HTTP_OK);
 }
 
 // static
 scoped_refptr<net::HttpResponseHeaders>
+ResponseProvider::GetDefaultResponseHeaders(const std::string& cookie) {
+  scoped_refptr<net::HttpResponseHeaders> result = GetDefaultResponseHeaders();
+  result->AddCookie(cookie);
+  return result;
+}
+
+// static
+scoped_refptr<net::HttpResponseHeaders>
 ResponseProvider::GetRedirectResponseHeaders(
     const std::string& destination,
     const net::HttpStatusCode& http_status) {
   scoped_refptr<net::HttpResponseHeaders> headers(
       GetResponseHeaders("text/html", http_status));
   headers->AddHeader("Location: " + destination);
   return headers;
 }
 
 }  // namespace web