PrintPreview: Added code to identify the printer default duplex value.

chrome/browser/resources/print_preview/print_preview.js

Index: chrome/browser/resources/print_preview/print_preview.js
diff --git a/chrome/browser/resources/print_preview/print_preview.js b/chrome/browser/resources/print_preview/print_preview.js
index 86459f30098d043ca06335eccde269f39e2016e4..bdf18eec42e2329c2847db7e8cddbe4fb9b0f26e 100644
--- a/chrome/browser/resources/print_preview/print_preview.js
+++ b/chrome/browser/resources/print_preview/print_preview.js
@@ -236,7 +236,7 @@ function updateControlsWithSelectedPrinterCapabilities() {
     updateWithPrinterCapabilities({
         'disableColorOption': true,
         'setColorAsDefault': true,
-        'setDuplexAsDefault': false,
+        'printerDefaultDuplexValue': 0,

[dpapad, 2011/09/02 03:01:07]

Could you use copiesSettings.simplex_ here instead of 0?

[kmadhusu, 2011/09/03 00:34:00]

Done.

         'disableCopiesOption': true});
   } else {
     // This message will call back to 'updateWithPrinterCapabilities'
@@ -340,7 +340,7 @@ function getSettings() {
   var settings =
       {'deviceName': deviceName,
        'pageRange': pageSettings.selectedPageRanges,
-       'duplex': copiesSettings.duplexMode,
+       'duplexInfo': copiesSettings.duplexModeInfo,
        'copies': copiesSettings.numberOfCopies,
        'collate': copiesSettings.isCollated(),
        'landscape': layoutSettings.isLandscape(),