headless: Make it possible to configure an HTTP proxy

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;
 
 namespace headless {
 
 // Product name for building the default user agent string.
 namespace {
 const char kProductName[] = "HeadlessChrome";
 }
 
 Options::Options(int argc, const char** argv)
     : argc(argc),
       argv(argv),
       user_agent(content::BuildUserAgentFromProduct(kProductName)),
       message_pump(nullptr) {}
 
 Options::~Options() {}
 
 Builder::Builder(int argc, const char** argv) : options_(argc, argv) {}
 
+Builder::Builder() : options_(0, nullptr) {}
+
 Builder::~Builder() {}
 
 Builder& Builder::SetUserAgent(const std::string& user_agent) {
   options_.user_agent = user_agent;
   return *this;
 }
 
 Builder& Builder::EnableDevToolsServer(const net::IPEndPoint& endpoint) {
   options_.devtools_endpoint = endpoint;
   return *this;
 }
 
 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;
+}
+
 Options Builder::Build() {
   return options_;
 }
 
 }  // namespace headless