Fix print preview workflow to reflect settings of selected printer.

chrome/browser/printing/print_dialog_gtk.cc

 // Copyright (c) 2011 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.
 
 #include "chrome/browser/printing/print_dialog_gtk.h"
 
 #include <fcntl.h>
 #include <gtk/gtkpagesetupunixdialog.h>
 #include <gtk/gtkprintjob.h>
 #include <sys/stat.h>
@@ skipping 157 matching lines @@
   if (!settings.GetBoolean(printing::kSettingLandscape, &landscape) ||
       !settings.GetBoolean(printing::kSettingCollate, &collate) ||
       !settings.GetInteger(printing::kSettingColor, &color) ||
       !settings.GetBoolean(printing::kSettingPrintToPDF, &print_to_pdf) ||
       !settings.GetInteger(printing::kSettingDuplexMode, &duplex_mode) ||
       !settings.GetInteger(printing::kSettingCopies, &copies) ||
       !settings.GetString(printing::kSettingDeviceName, &device_name)) {
     return false;
   }
 
+  if (!gtk_settings_)
+    gtk_settings_ = gtk_print_settings_new();
+
   if (!print_to_pdf) {
     scoped_ptr<GtkPrinterList> printer_list(new GtkPrinterList);
     printer_ = printer_list->GetPrinterWithName(device_name.c_str());
     if (printer_) {
       g_object_ref(printer_);
       gtk_print_settings_set_printer(gtk_settings_,
                                      gtk_printer_get_name(printer_));
+      if (!page_setup_) {
+        page_setup_ = gtk_printer_get_default_page_size(printer_);
+      }
     }
+    if (!page_setup_)
+      page_setup_ = gtk_page_setup_new();
+
     gtk_print_settings_set_n_copies(gtk_settings_, copies);
     gtk_print_settings_set_collate(gtk_settings_, collate);
 
     const char* color_mode;
     switch (color) {
       case printing::COLOR:
         color_mode = kColor;
         break;
       case printing::CMYK:
         color_mode = kCMYK;
@@ skipping 203 matching lines @@
   // Printing finished. Matches AddRef() in PrintDocument();
   Release();
 }
 
 void PrintDialogGtk::InitPrintSettings(const PageRanges& page_ranges) {
   PrintSettings settings;
   printing::PrintSettingsInitializerGtk::InitPrintSettings(
       gtk_settings_, page_setup_, page_ranges, false, &settings);
   context_->InitWithSettings(settings);
 }