add customized printing setting for headless

headless/app/headless_shell.cc

 // Copyright 2016 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 <memory>
 #include <sstream>
 #include <string>
 #include <utility>
 
 #include "base/base64.h"
@@ skipping 342 matching lines @@
     LOG(ERROR) << "Capture screenshot failed";
     Shutdown();
     return;
   }
   WriteFile(switches::kScreenshot, kDefaultScreenshotFileName,
             result->GetData());
 }
 
 void HeadlessShell::PrintToPDF() {
   devtools_client_->GetPage()->GetExperimental()->PrintToPDF(
-      page::PrintToPDFParams::Builder().Build(),
+      page::PrintToPDFParams::Builder()
+          .SetDisplayHeaderFooter(true)
+          .SetPrintBackgrounds(true)
+          .Build(),
       base::Bind(&HeadlessShell::OnPDFCreated, weak_factory_.GetWeakPtr()));
 }
 
 void HeadlessShell::OnPDFCreated(
     std::unique_ptr<page::PrintToPDFResult> result) {
   if (!result) {
     LOG(ERROR) << "Print to PDF failed";
     Shutdown();
     return;
   }
@@ skipping 218 matching lines @@
     if (net::HttpUtil::IsValidHeaderValue(ua))
       builder.SetUserAgent(ua);
   }
 
   return HeadlessBrowserMain(
       builder.Build(),
       base::Bind(&HeadlessShell::OnStart, base::Unretained(&shell)));
 }
 
 }  // namespace headless