Added a test that currently is able to print to pdf.

chrome/browser/resources/print_preview/print_preview.js

 // Copyright (c) 2012 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.
 
 // TODO(rltoscano): Move data/* into print_preview.data namespace
 
 var localStrings = new LocalStrings(templateData);
 
 <include src="component.js"/>
 
@@ skipping 267 matching lines @@
           print_preview.NativeLayer.EventType.SETTINGS_INVALID,
           this.onSettingsInvalid_.bind(this));
       this.tracker.add(
           this.nativeLayer_,
           print_preview.NativeLayer.EventType.DISABLE_SCALING,
           this.onDisableScaling_.bind(this));
       this.tracker.add(
           this.nativeLayer_,
           print_preview.NativeLayer.EventType.PRIVET_PRINT_FAILED,
           this.onPrivetPrintFailed_.bind(this));
-
+      this.tracker.add(
+          this.nativeLayer_,
+          print_preview.NativeLayer.EventType.MANIPULATE_SETTINGS_FOR_TEST,
+          this.onManipulateSettingsForTest_.bind(this));
 
       this.tracker.add(
           $('system-dialog-link'),
           'click',
           this.openSystemPrintDialog_.bind(this));
       this.tracker.add(
           $('cloud-print-dialog-link'),
           'click',
           this.onCloudPrintDialogLinkClick_.bind(this));
       this.tracker.add(
@@ skipping 385 matching lines @@
       this.isPreviewGenerationInProgress_ = true;
     },
 
     /**
      * Called when the preview area's preview generation is complete.
      * @private
      */
     onPreviewGenerationDone_: function() {
       this.isPreviewGenerationInProgress_ = false;
       this.printHeader_.isPrintButtonEnabled = true;
+      this.nativeLayer_.previewReadyForTest();
       this.printIfReady_();
     },
 
     /**
      * Called when the preview area's preview failed to load.
      * @private
      */
     onPreviewGenerationFail_: function() {
       this.isPreviewGenerationInProgress_ = false;
       this.printHeader_.isPrintButtonEnabled = false;
@@ skipping 179 matching lines @@
      * @private
      */
     onPrivetPrintFailed_: function(event) {
       console.error('Privet printing failed with error code ' +
                     event.httpError);
       this.printHeader_.setErrorMessage(
         localStrings.getString('couldNotPrint'));
     },
 
     /**
+     * Called when the print preview settings need to be changed for testing.
+     * @param {Event} event Event object that contains the option that is to
+     *     be changed and what to set that option.
+     * @private
+     */
+    onManipulateSettingsForTest_: function(event) {
+      if ('selectSaveAsPdfDestination' in event.settings) {
+        this.saveAsPdfForTest_(); // No parameters needed.

[Dan Beam, 2014/07/08 04:25:14]

nit:
  this.saveAsPdfForTest_();  // No parameters needed.
                           ^^ 2 \s

[ivandavid, 2014/07/08 23:24:21]

Done.

+      } else if ('layoutSettings' in event.settings) {
+        this.setLayoutSettingsForTest_(event.settings.layoutSettings.portrait);
+      } else if ('pageRange' in event.settings) {
+        this.setPageRangeForTest_(event.settings.pageRange);
+      } else if ('headersAndFooters' in event.settings) {
+        this.setHeadersAndFootersForTest_(event.settings.headersAndFooters);
+      } else if ('backgroundColorsAndImages' in event.settings) {
+        this.setBackgroundColorsAndImagesForTest_(
+            event.settings.backgroundColorsAndImages);
+      } else if ('margins' in event.settings) {
+        this.setMarginsForTest_(event.settings.margins);
+      }
+    },
+
+    /**
+     * Called by onManipulateSettingsForTest_(). Sets the print destination
+     * as a pdf.
+     * @private
+     */
+    saveAsPdfForTest_: function() {
+      if (print_preview.Destination.GooglePromotedId.SAVE_AS_PDF ==
+            this.destinationStore_.selectedDestination.id) {
+        this.nativeLayer_.previewReadyForTest();
+        return;
+      }
+
+      var destinations = this.destinationStore_.destinations();
+      var pdfDestination = null;
+      for (var i = 0; i < destinations.length; i++) {
+        if (destinations[i].id ==
+            print_preview.Destination.GooglePromotedId.SAVE_AS_PDF) {
+          pdfDestination = destinations[i];
+          break;
+        }
+      }
+
+      if (pdfDestination)
+        this.destinationStore_.selectDestination(pdfDestination);
+      else
+        this.nativeLayer_.previewFailedForTest();
+    },
+
+    /**
+     * Called by onManipulateSettingsForTest_(). Sets the layout settings to
+     * either portrait or landscape.
+     * @param {boolean} portrait Whether to use portrait page layout;
+     *     if false: landscape

[Dan Beam, 2014/07/08 04:25:14]

nit: . at end

[ivandavid, 2014/07/08 23:24:21]

Done.

+     * @private
+     */
+    setLayoutSettingsForTest_: function(portrait) {
+      var element = document.querySelector(
+          portrait ?
+              '.layout-settings-portrait-radio' :
+              '.layout-settings-landscape-radio');

[Dan Beam, 2014/07/08 04:25:13]

nit:
  var mode = portrait ? 'portrait' : 'landscape';
  var element = document.querySelector('.layout-settings-' + mode + '-radio');

[Aleksey Shlyapnikov, 2014/07/08 17:21:35]

Please keep it as it is, code search won't find these classes if you follow the
advice. You can save one line this way:

var element = document.querySelector(portrait ?
    '.layout-settings-portrait-radio' :
    '.layout-settings-landscape-radio');

[Dan Beam, 2014/07/08 17:54:32]

that's fine too

[ivandavid, 2014/07/08 23:24:21]

Done.

+      if (element.checked)
+        this.nativeLayer_.previewReadyForTest();
+      else
+        element.click();
+    },
+
+    /**
+     * Called by onManipulateSettingsForTest_(). Sets the page range for
+     * for the print preview settings.
+     * @param {string} pageRange Sets the page range to the desired value(s).
+     *     Ex: "1-5,9" means pages 1 through 5 and page 9 will be printed.
+     * @private
+     */
+    setPageRangeForTest_: function(pageRange) {
+      var textbox = document.querySelector('.page-settings-custom-input');
+      if (textbox.value == pageRange) {
+        this.nativeLayer_.previewReadyForTest();
+      } else {
+        textbox.value = pageRange;
+        document.querySelector('.page-settings-custom-radio').click();
+      }
+    },
+
+    /**
+     * Called by onManipulateSettings_(). Checks or unchecks the headers and
+     * footers option on print preview.
+     * @param {boolean} headersAndFooters Whether the "Headers and Footers"
+     *     checkbox should be checked.
+     * @private
+     */
+    setHeadersAndFootersForTest_: function(headersAndFooters) {
+      var checkbox = document.querySelector('.header-footer-checkbox');
+      if (headersAndFooters == checkbox.checked)
+        this.nativeLayer_.previewReadyForTest();
+      else
+        checkbox.click();
+    },
+
+    /**
+     * Called by onManipulateSettings_(). Checks or unchecks the background
+     * colors and images option on print preview.
+     * @param {boolean} backgroundColorsAndImages If true, the checkbox should
+     *     be checked. Otherwise it should be unchecked.
+     * @private
+     */
+    setBackgroundColorsAndImagesForTest_: function(backgroundColorsAndImages) {
+      var checkbox = document.querySelector('.css-background-checkbox');
+      if (backgroundColorsAndImages == checkbox.checked)
+        this.nativeLayer_.previewReadyForTest();
+      else
+        checkbox.click();
+    },
+
+    /**
+     * Called by onManipulateSettings_(). Sets the margin settings
+     * that are desired. Custom margin settings aren't currently supported.
+     * @param {number} margins The desired margins combobox index. Must be
+     *     a valid index or else the test fails.
+     * @private
+     */
+    setMarginsForTest_: function(margins) {
+      var combobox = document.querySelector('.margin-settings-select');
+      if (margins == combobox.selectedIndex) {
+        this.nativeLayer_.previewReadyForTest();
+      } else if (margins >= 0 && margins < combobox.length) {
+        combobox.selectedIndex = margins;
+        this.marginSettings_.onSelectChange_();
+      } else {
+        this.nativeLayer_.previewFailedForTest();
+      }
+    },
+
+    /**
      * Called when the open-cloud-print-dialog link is clicked. Opens the Google
      * Cloud Print web dialog.
      * @private
      */
     onCloudPrintDialogLinkClick_: function() {
       assert(this.uiState_ == PrintPreview.UiState_.READY,
              'Opening Google Cloud Print dialog when not in ready state: ' +
                  this.uiState_);
       setIsVisible($('cloud-print-dialog-throbber'), true);
       this.setIsEnabled_(false);
@@ skipping 131 matching lines @@
 <include src="search/recent_destination_list.js"/>
 <include src="search/destination_list_item.js"/>
 <include src="search/destination_search.js"/>
 <include src="search/search_box.js"/>
 <include src="search/fedex_tos.js"/>
 
 window.addEventListener('DOMContentLoaded', function() {
   printPreview = new print_preview.PrintPreview();
   printPreview.initialize();
 });