printing: add missing header files to BUILD.gn

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/sysroot.gni")
 import("//build/config/ui.gni")
 import("//pdf/features.gni")
 import("//printing/features/features.gni")
 import("//testing/test.gni")
@@ skipping 36 matching lines @@
     "page_number.h",
     "page_range.cc",
     "page_range.h",
     "page_setup.cc",
     "page_setup.h",
     "page_size_margins.h",
     "pdf_metafile_cg_mac.cc",
     "pdf_metafile_cg_mac.h",
     "pdf_metafile_skia.cc",
     "pdf_metafile_skia.h",
+    "pdf_render_settings.h",
     "print_dialog_gtk_interface.h",
     "print_job_constants.cc",
     "print_job_constants.h",
     "print_settings.cc",
     "print_settings.h",
     "print_settings_conversion.cc",
     "print_settings_conversion.h",
     "print_settings_initializer_mac.cc",
     "print_settings_initializer_mac.h",
     "print_settings_initializer_win.cc",
     "print_settings_initializer_win.h",
     "printed_document.cc",
     "printed_document.h",
     "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_export.h",
     "printing_utils.cc",
     "printing_utils.h",
+    "pwg_raster_settings.h",
     "units.cc",
     "units.h",
   ]
 
   cflags = []
   defines = [ "PRINTING_IMPLEMENTATION" ]
 
   public_deps = [
     "//printing/features",
   ]
@@ skipping 246 matching lines @@
       "android/java/src/org/chromium/printing/PrintManagerDelegate.java",
       "android/java/src/org/chromium/printing/PrintManagerDelegateImpl.java",
       "android/java/src/org/chromium/printing/Printable.java",
       "android/java/src/org/chromium/printing/PrintingContext.java",
       "android/java/src/org/chromium/printing/PrintingContextInterface.java",
       "android/java/src/org/chromium/printing/PrintingController.java",
       "android/java/src/org/chromium/printing/PrintingControllerImpl.java",
     ]
   }
 }