Print preview: A quick hack to support printing to the default printer without user confirmation ...

chrome/browser/resources/print_preview/print_preview.js

 // 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.
 
 // require: cr/ui/print_preview_cloud.js
 
 var localStrings = new LocalStrings();
 
 // If useCloudPrint is true we attempt to connect to cloud print
 // and populate the list of printers with cloud print printers.
@@ skipping 35 matching lines @@
 
 // True when a pending print file request exists.
 var hasPendingPrintDocumentRequest = false;
 
 // True when the complete metafile for the previewed doc is ready.
 var isPrintReadyMetafileReady = false;
 
 // True when preview tab is hidden.
 var isTabHidden = false;
 
+// True in kiosk mode where print preview can print automatically without
+// user intervention. See http://crbug.com/31395.
+var printAutomaticallyInKioskMode = false;
+
 // @type {print_preview.PrintHeader} Holds the print and cancel buttons.
 var printHeader;
 
 // @type {print_preview.PageSettings} Holds all the pages related settings.
 var pageSettings;
 
 // @type {print_preview.CopiesSettings} Holds all the copies related settings.
 var copiesSettings;
 
 // @type {print_preview.LayoutSettings} Holds all the layout related settings.
@@ skipping 118 matching lines @@
   setInitiatorTabTitle(initialSettings['initiatorTabTitle']);
   previewModifiable = initialSettings['previewModifiable'];
   if (previewModifiable) {
     print_preview.MarginSettings.setNumberFormatAndMeasurementSystem(
         initialSettings['numberFormat'],
         initialSettings['measurementSystem']);
     marginSettings.setLastUsedMargins(initialSettings);
   }
   setDefaultPrinter(initialSettings['printerName'],
                     initialSettings['cloudPrintData']);
+  printAutomaticallyInKioskMode =
+      initialSettings['printAutomaticallyInKioskMode'];
 }
 
 /**
  * Disables the input elements in the sidebar.
  */
 function disableInputElementsInSidebar() {
   var els = $('navbar-container').querySelectorAll('input, button, select');
   for (var i = 0; i < els.length; i++) {
     if (els[i] == printHeader.cancelButton)
       continue;
@@ skipping 604 matching lines @@
  * Called when the PDF plugin loads its document.
  */
 function onPDFLoad() {
   if (previewModifiable) {
     setPluginPreviewPageCount();
   }
   cr.dispatchSimpleEvent(document, customEvents.PDF_LOADED);
   isFirstPageLoaded = true;
   checkAndHideOverlayLayerIfValid();
   sendPrintDocumentRequestIfNeeded();
+  if (printAutomaticallyInKioskMode)
+    printHeader.printButton.click();
 }
 
 function setPluginPreviewPageCount() {
   $('pdf-viewer').printPreviewPageCount(
       pageSettings.previouslySelectedPages.length);
 }
 
 /**
  * Update the page count and check the page range.
  * Called from PrintPreviewUI::OnDidGetPreviewPageCount().
@@ skipping 324 matching lines @@
 <include src="copies_settings.js"/>
 <include src="header_footer_settings.js"/>
 <include src="layout_settings.js"/>
 <include src="color_settings.js"/>
 <include src="margin_settings.js"/>
 <include src="margin_textbox.js"/>
 <include src="margin_utils.js"/>
 <include src="margins_ui.js"/>
 <include src="margins_ui_pair.js"/>
 <include src="preview_area.js"/>