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

chrome/test/data/webui/print_preview.js

Index: chrome/test/data/webui/print_preview.js
diff --git a/chrome/test/data/webui/print_preview.js b/chrome/test/data/webui/print_preview.js
index dacefd0563fc1d7a626a87ba508f3b66d34069dd..e4827f114e4915ca87f03ca16b48394caf519d19 100644
--- a/chrome/test/data/webui/print_preview.js
+++ b/chrome/test/data/webui/print_preview.js
@@ -68,6 +68,7 @@ PrintPreviewWebUITest.prototype = {
             disableColorOption: true,
             setColorAsDefault: true,
             disableCopiesOption: true,
+            printerDefaultDuplexValue: copiesSettings.UNKNOWN,
           });
         }));
     var savedArgs = new SaveMockArguments();
@@ -298,6 +299,7 @@ TEST_F('PrintPreviewWebUITest', 'TestSectionsDisabled', function() {
           setColorAsDefault: true,
           disableCopiesOption: true,
           disableLandscapeOption: true,
+          printerDefaultDuplexValue: copiesSettings.SIMPLEX,
         });
       }));
 
@@ -317,6 +319,7 @@ TEST_F('PrintPreviewWebUITest', 'TestColorSettings', function() {
           setColorAsDefault: true,
           disableCopiesOption: false,
           disableLandscapeOption: false,
+          printerDefaultDuplexValue: copiesSettings.SIMPLEX,
         });
       }));
 
@@ -331,6 +334,7 @@ TEST_F('PrintPreviewWebUITest', 'TestColorSettings', function() {
           setColorAsDefault: false,
           disableCopiesOption: false,
           disableLandscapeOption: false,
+          printerDefaultDuplexValue: copiesSettings.SIMPLEX,
         });
       }));
 
@@ -339,6 +343,41 @@ TEST_F('PrintPreviewWebUITest', 'TestColorSettings', function() {
   expectTrue(colorSettings.bwRadioButton.checked);
 });
 
+// Test to verify that duplex settings are set according to the printer
+// capabilities.
+TEST_F('PrintPreviewWebUITest', 'TestDuplexSettings', function() {
+  this.mockHandler.expects(once()).getPrinterCapabilities('FooDevice').
+      will(callFunction(function() {
+        updateWithPrinterCapabilities({
+          disableColorOption: false,
+          setColorAsDefault: false,
+          disableCopiesOption: false,
+          disableLandscapeOption: false,
+          printerDefaultDuplexValue: copiesSettings.SIMPLEX,
+        });
+      }));
+  updateControlsWithSelectedPrinterCapabilities();
+  expectEquals(copiesSettings.duplexMode, copiesSettings.SIMPLEX);
+
+  // If the printer default duplex value is UNKNOWN and the user has selected
+  // duplex printing, we set print job duplex setting as DUPLEX.
+  this.mockHandler.expects(once()).getPrinterCapabilities('FooDevice').
+      will(callFunction(function() {
+        updateWithPrinterCapabilities({
+          disableColorOption: false,
+          setColorAsDefault: false,
+          disableCopiesOption: false,
+          disableLandscapeOption: false,
+          printerDefaultDuplexValue: copiesSettings.UNKNOWN,
+        });
+      }));
+  updateControlsWithSelectedPrinterCapabilities();
+  expectEquals(copiesSettings.duplexMode, copiesSettings.SIMPLEX);
+  copiesSettings.twoSidedCheckbox.checked = true;
+  expectEquals(copiesSettings.duplexMode, copiesSettings.DUPLEX);
+
+});
+
 // Test that changing the selected printer updates the preview.
 TEST_F('PrintPreviewWebUITest', 'TestPrinterChangeUpdatesPreview', function() {
   var savedArgs = new SaveMockArguments();