add print to pdf for headless

headless/lib/headless_content_main_delegate.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 "headless/lib/headless_content_main_delegate.h"
 
+#include <utility>
+
 #include "base/base_switches.h"
 #include "base/command_line.h"
 #include "base/environment.h"
 #include "base/files/file_util.h"
 #include "base/lazy_instance.h"
 #include "base/path_service.h"
 #include "base/run_loop.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/trace_event/trace_event.h"
 #include "components/crash/content/app/breakpad_linux.h"
 #include "content/public/browser/browser_main_runner.h"
 #include "content/public/common/content_switches.h"
 #include "headless/lib/browser/headless_browser_impl.h"
 #include "headless/lib/browser/headless_content_browser_client.h"
 #include "headless/lib/headless_crash_reporter_client.h"
 #include "headless/lib/headless_macros.h"
+#include "headless/lib/renderer/headless_content_renderer_client.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/base/ui_base_switches.h"
 #include "ui/gfx/switches.h"
 #include "ui/gl/gl_switches.h"
 #include "ui/ozone/public/ozone_switches.h"
 
 #ifdef HEADLESS_USE_EMBEDDED_RESOURCES
 #include "headless/embedded_resource_pak.h"
 #endif
 
@@ skipping 229 matching lines @@
   if (!base::PathExists(pak_file))
     pak_file = dir_module.Append(FILE_PATH_LITERAL("Resources/resources.pak"));
 #endif
   ResourceBundle::GetSharedInstance().AddDataPackFromPath(
       pak_file, ui::SCALE_FACTOR_NONE);
 #endif
 }
 
 content::ContentBrowserClient*
 HeadlessContentMainDelegate::CreateContentBrowserClient() {
-  browser_client_.reset(new HeadlessContentBrowserClient(browser_.get()));
+  browser_client_ =
+      base::MakeUnique<HeadlessContentBrowserClient>(browser_.get());
   return browser_client_.get();
 }
 
+content::ContentRendererClient*
+HeadlessContentMainDelegate::CreateContentRendererClient() {
+  renderer_client_ = base::MakeUnique<HeadlessContentRendererClient>();
+  return renderer_client_.get();
+}
+
 }  // namespace headless