add print to pdf for headless

headless/lib/renderer/headless_print_web_view_helper_delegate.cc

+// Copyright (c) 2017 The Chromium Authors. All rights reserved.

[Lei Zhang, 2017/03/29 05:30:16]

No (c)

[jzfeng, 2017/03/30 03:04:57]

Done.

+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "headless/lib/renderer/headless_print_web_view_helper_delegate.h"
+
+#include "third_party/WebKit/public/web/WebElement.h"
+
+namespace headless {
+
+HeadlessPrintWebViewHelperDelegate::HeadlessPrintWebViewHelperDelegate() {}
+
+HeadlessPrintWebViewHelperDelegate::~HeadlessPrintWebViewHelperDelegate() {}
+
+bool HeadlessPrintWebViewHelperDelegate::CancelPrerender(
+    content::RenderFrame* render_frame) {
+  return false;
+}
+
+blink::WebElement HeadlessPrintWebViewHelperDelegate::GetPdfElement(
+    blink::WebLocalFrame* frame) {
+  return blink::WebElement();
+}
+
+bool HeadlessPrintWebViewHelperDelegate::IsPrintPreviewEnabled() {
+  return false;
+}
+
+bool HeadlessPrintWebViewHelperDelegate::OverridePrint(
+    blink::WebLocalFrame* frame) {
+  return false;
+}
+
+bool HeadlessPrintWebViewHelperDelegate::IsAskPrintSettingsEnabled() {
+  return false;
+}
+
+}  // namespace headless