Generate the print messages in components/printing

components/printing.gypi

 # Copyright 2015 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.
 
 {
   'targets': [
     {
       # GN: //components/printing/common:printing_common
       'target_name': 'printing_common',
       'type': 'static_library',
       'dependencies': [
         '<(DEPTH)/base/base.gyp:base',
         '<(DEPTH)/ipc/ipc.gyp:ipc',
         '<(DEPTH)/printing/printing.gyp:printing',
         '<(DEPTH)/third_party/WebKit/public/blink.gyp:blink',
         '<(DEPTH)/ui/gfx/gfx.gyp:gfx',
       ],
       'sources': [
         "printing/common/print_messages.cc",
         "printing/common/print_messages.h",
+        "printing/common/printing_message_generator.cc",
+        "printing/common/printing_message_generator.h",
       ],
     },{
        # GN: //components/printing/common:printing_renderer
       'target_name': 'printing_renderer',
       'type': 'static_library',
       'dependencies': [
         '<(DEPTH)/base/base.gyp:base',
         '<(DEPTH)/content/content.gyp:content_common',
         '<(DEPTH)/content/content.gyp:content_renderer',
         '<(DEPTH)/net/net.gyp:net',
         '<(DEPTH)/printing/printing.gyp:printing',
         '<(DEPTH)/third_party/WebKit/public/blink.gyp:blink',
         '<(DEPTH)/ui/base/ui_base.gyp:ui_base',
         'components_resources.gyp:components_resources',
         'printing_common',
       ],
       'sources': [
         'printing/renderer/print_web_view_helper.cc',
         'printing/renderer/print_web_view_helper.h',
         'printing/renderer/print_web_view_helper_android.cc',
         'printing/renderer/print_web_view_helper_linux.cc',
         'printing/renderer/print_web_view_helper_mac.mm',
         'printing/renderer/print_web_view_helper_pdf_win.cc',
       ],
       # TODO(dgn): C4267: http://crbug.com/167187 size_t -> int
       'msvs_disabled_warnings': [ 4267 ],
     },
   ],
 }