add customized printing setting for headless

content/browser/devtools/protocol/page_handler.cc

 // Copyright 2014 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/browser/devtools/protocol/page_handler.h"
 
 #include <algorithm>
 #include <memory>
 #include <string>
 #include <utility>
@@ skipping 280 matching lines @@
   std::string screenshot_format = format.fromMaybe(kPng);
   int screenshot_quality = quality.fromMaybe(kDefaultScreenshotQuality);
 
   host_->GetRenderWidgetHost()->GetSnapshotFromBrowser(
       base::Bind(&PageHandler::ScreenshotCaptured, weak_factory_.GetWeakPtr(),
                  base::Passed(std::move(callback)), screenshot_format,
                  screenshot_quality),
       from_surface.fromMaybe(false));
 }
 
-void PageHandler::PrintToPDF(std::unique_ptr<PrintToPDFCallback> callback) {
+void PageHandler::PrintToPDF(Maybe<bool> landscape,
+                             Maybe<bool> display_header_footer,
+                             Maybe<bool> print_background,
+                             Maybe<double> scale,
+                             Maybe<double> paper_width,
+                             Maybe<double> paper_height,
+                             Maybe<double> margin_top,
+                             Maybe<double> margin_bottom,
+                             Maybe<double> margin_left,
+                             Maybe<double> margin_right,
+                             Maybe<String> page_ranges,
+                             std::unique_ptr<PrintToPDFCallback> callback) {
   callback->sendFailure(Response::Error("PrintToPDF is not implemented"));
   return;
 }
 
 Response PageHandler::StartScreencast(Maybe<std::string> format,
                                       Maybe<int> quality,
                                       Maybe<int> max_width,
                                       Maybe<int> max_height,
                                       Maybe<int> every_nth_frame) {
   RenderWidgetHostImpl* widget_host =
@@ skipping 262 matching lines @@
 Response PageHandler::StopLoading() {
   WebContentsImpl* web_contents = GetWebContents();
   if (!web_contents)
     return Response::InternalError();
   web_contents->Stop();
   return Response::OK();
 }
 
 }  // namespace protocol
 }  // namespace content