add print to pdf for headless

headless/BUILD.gn

Index: headless/BUILD.gn
diff --git a/headless/BUILD.gn b/headless/BUILD.gn
index 2d83fadcc35e60c8e30cd7bdae08ed9e04e70247..89cf139b44cfdad4c2c2ebc197041366a386f868 100644
--- a/headless/BUILD.gn
+++ b/headless/BUILD.gn
@@ -213,6 +213,8 @@ static_library("headless_lib") {
               "lib/browser/headless_network_delegate.h",
               "lib/browser/headless_platform_event_source.cc",
               "lib/browser/headless_platform_event_source.h",
+              "lib/browser/headless_print_manager.cc",
+              "lib/browser/headless_print_manager.h",
               "lib/browser/headless_shell_application_mac.mm",
               "lib/browser/headless_shell_application_mac.h",
               "lib/browser/headless_url_request_context_getter.cc",
@@ -225,6 +227,10 @@ static_library("headless_lib") {
               "lib/headless_content_client.h",
               "lib/headless_content_main_delegate.cc",
               "lib/headless_content_main_delegate.h",
+              "lib/renderer/headless_content_renderer_client.cc",
+              "lib/renderer/headless_content_renderer_client.h",
+              "lib/renderer/headless_print_web_view_helper_delegate.cc",
+              "lib/renderer/headless_print_web_view_helper_delegate.h",
               "public/headless_browser.cc",
               "public/headless_browser.h",
               "public/headless_browser_context.h",
@@ -290,6 +296,8 @@ static_library("headless_lib") {
     ":version_header",
     "//base",
     "//components/crash/content/browser",
+    "//components/printing/browser",
+    "//components/printing/renderer",
     "//components/security_state/content",
     "//components/security_state/core",
     "//content/public/app:both",