Add missing printExtension to print settings for print preview

BUG=461888

Review URL: https://codereview.chromium.org/957123002

Cr-Commit-Position: refs/heads/master@{#318852}

chrome/browser/resources/print_preview/native_layer.js

@@ -265,6 +265,7 @@ cr.define('print_preview', function() {
                 print_preview.Destination.GooglePromotedId.SAVE_AS_PDF,
         'printWithCloudPrint': destination != null && !destination.isLocal,
         'printWithPrivet': destination != null && destination.isPrivet,
+        'printWithExtension': destination != null && destination.isExtension,
         'deviceName': destination == null ? 'foo' : destination.id,
         'generateDraftData': documentInfo.isModifiable,
         'fitToPageEnabled': printTicketStore.fitToPage.getValue(),

printing/printing_context.cc

@@ -63,6 +63,7 @@ PrintingContext::Result PrintingContext::UsePdfSettings() {
   pdf_settings->SetBoolean(kSettingPrintToPDF, true);
   pdf_settings->SetBoolean(kSettingCloudPrintDialog, false);
   pdf_settings->SetBoolean(kSettingPrintWithPrivet, false);
+  pdf_settings->SetBoolean(kSettingPrintWithExtension, false);
   return UpdatePrintSettings(*pdf_settings);
 }
 
@@ -78,10 +79,13 @@ PrintingContext::Result PrintingContext::UpdatePrintSettings(
   bool print_to_pdf = false;
   bool is_cloud_dialog = false;
   bool print_with_privet = false;
+  bool print_with_extension = false;
 
   if (!job_settings.GetBoolean(kSettingPrintToPDF, &print_to_pdf) ||
       !job_settings.GetBoolean(kSettingCloudPrintDialog, &is_cloud_dialog) ||
-      !job_settings.GetBoolean(kSettingPrintWithPrivet, &print_with_privet)) {
+      !job_settings.GetBoolean(kSettingPrintWithPrivet, &print_with_privet) ||
+      !job_settings.GetBoolean(kSettingPrintWithExtension,
+                               &print_with_extension)) {
     NOTREACHED();
     return OnError();
   }
@@ -90,8 +94,9 @@ PrintingContext::Result PrintingContext::UpdatePrintSettings(
   bool open_in_external_preview =
       job_settings.HasKey(kSettingOpenPDFInPreview);
 
-  if (!open_in_external_preview && (print_to_pdf || print_to_cloud ||
-                                    is_cloud_dialog || print_with_privet)) {
+  if (!open_in_external_preview &&
+      (print_to_pdf || print_to_cloud || is_cloud_dialog || print_with_privet ||
+       print_with_extension)) {
     settings_.set_dpi(kDefaultPdfDpi);
     gfx::Size paper_size(GetPdfPaperSizeDeviceUnits());
     if (!settings_.requested_media().size_microns.IsEmpty()) {