Add some more headless API feature placeholders

headless/public/headless_browser.h

 // 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.
 
 #ifndef HEADLESS_PUBLIC_HEADLESS_BROWSER_H_
 #define HEADLESS_PUBLIC_HEADLESS_BROWSER_H_
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
@@ skipping 56 matching lines @@
 struct HeadlessBrowser::Options {
   ~Options();
 
   class Builder;
 
   // Command line options to be passed to browser.
   int argc;
   const char** argv;
 
   std::string user_agent;
+  std::string navigator_platform;
 
   static const int kInvalidPort = -1;
   // If not null, create start devtools for remote debugging
   // on specified port.
   int devtools_http_port;
 
   // Optional URLRequestContextGetter for customizing network stack.
+  // Allows overriding:
+  // - Cookie storage
+  // - HTTP cache
+  // - SSL config
+  // - Proxy service
   scoped_refptr<net::URLRequestContextGetter> url_request_context_getter;
 
+  scoped_ptr<base::MessagePump> message_pump;
+
  private:
   Options(int argc, const char** argv);
 };
 
 class HeadlessBrowser::Options::Builder {
  public:
   Builder(int argc, const char** argv);
   ~Builder();
 
   Builder& SetUserAgent(const std::string& user_agent);
   Builder& EnableDevToolsServer(int port);
   Builder& SetURLRequestContextGetter(
       scoped_refptr<net::URLRequestContextGetter> url_request_context_getter);
 
   Options Build();
 
  private:
   Options options_;
 
   DISALLOW_COPY_AND_ASSIGN(Builder);
 };
 
 }  // namespace headless
 
 #endif  // HEADLESS_PUBLIC_HEADLESS_BROWSER_H_