headless: Initial headless embedder API implementation

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 {
 
 Options::Options(int argc, const char** argv)
-    : argc(argc), argv(argv), devtools_http_port(kInvalidPort) {}
+    : argc(argc),
+      argv(argv),
+      user_agent(content::BuildUserAgentFromProduct("HeadlessChrome")),

[Ryan Sleevi, 2016/02/22 22:01:21]

This is the sort of thing that likely belongs as a constant, in a well-specified
place?

[Sami, 2016/02/23 20:19:08]

Yep, done.

+      devtools_http_port(kInvalidPort),
+      message_pump(nullptr) {}
 
 Options::~Options() {}
 
 Builder::Builder(int argc, const char** argv) : options_(argc, argv) {}
 
 Builder::~Builder() {}
 
 Builder& Builder::SetUserAgent(const std::string& user_agent) {
   options_.user_agent = user_agent;
   return *this;
 }
 
 Builder& Builder::EnableDevToolsServer(int port) {
   options_.devtools_http_port = port;
   return *this;
 }
 
 Builder& Builder::SetURLRequestContextGetter(
     scoped_refptr<net::URLRequestContextGetter> url_request_context_getter) {
   options_.url_request_context_getter = url_request_context_getter;
   return *this;
 }
 
+Builder& Builder::SetMessagePump(base::MessagePump* message_pump) {
+  options_.message_pump = message_pump;
+  return *this;
+}
+
 Options Builder::Build() {
   return options_;
 }
 
 }  // namespace headless