headless: Add support for host resolver mapping

headless/public/headless_browser.cc

 // Copyright 2015 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 "content/public/common/user_agent.h"
 #include "headless/public/headless_browser.h"
 #include "net/url_request/url_request_context_getter.h"
 
 using Options = headless::HeadlessBrowser::Options;
 using Builder = headless::HeadlessBrowser::Options::Builder;
@@ skipping 34 matching lines @@
 Builder& Builder::SetMessagePump(base::MessagePump* message_pump) {
   options_.message_pump = message_pump;
   return *this;
 }
 
 Builder& Builder::SetProxyServer(const net::HostPortPair& proxy_server) {
   options_.proxy_server = proxy_server;
   return *this;
 }
 
+Builder& Builder::SetHostResolverRules(const std::string& host_resolver_rules) {
+  options_.host_resolver_rules = host_resolver_rules;
+  return *this;
+}
+
 Options Builder::Build() {
   return options_;
 }
 
 }  // namespace headless