Generate the print messages in components/printing

printing/BUILD.gn

 # 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.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 if (is_mac) {
   import("//build/config/mac/mac_sdk.gni")
 }
 if (is_android) {
@@ skipping 46 matching lines @@
     "printed_document.cc",
     "printed_document.h",
     "printed_document_linux.cc",
     "printed_document_mac.cc",
     "printed_document_win.cc",
     "printed_page.cc",
     "printed_page.h",
     "printed_pages_source.h",
     "printing_context.cc",
     "printing_context.h",
+    "printing_param_traits_macros.h",
     "printing_utils.cc",
     "printing_utils.h",
     "units.cc",
     "units.h",
   ]
 
   cflags = []
   defines = [ "PRINTING_IMPLEMENTATION" ]
 
   deps = [
@@ skipping 163 matching lines @@
   }
 
   # GYP: //printing/printing.gyp:printing_java
   android_library("printing_java") {
     deps = [
       "//base:base_java",
     ]
     DEPRECATED_java_in_dir = "android/java/src"
   }
 }