Assume 1 collated copy for print preview generation

chrome/browser/resources/print_preview/native_layer.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.
 
 cr.exportPath('print_preview');
 
 /**
  * @typedef {{selectSaveAsPdfDestination: boolean,
  *            layoutSettings.portrait: boolean,
  *            pageRange: string,
@@ skipping 226 matching lines @@
         'printWithCloudPrint': destination != null && !destination.isLocal,
         'printWithPrivet': destination != null && destination.isPrivet,
         'deviceName': destination == null ? 'foo' : destination.id,
         'generateDraftData': documentInfo.isModifiable,
         'fitToPageEnabled': printTicketStore.fitToPage.getValue(),
 
         // NOTE: Even though the following fields don't directly relate to the
         // preview, they still need to be included.
         'duplex': printTicketStore.duplex.getValue() ?
             NativeLayer.DuplexMode.LONG_EDGE : NativeLayer.DuplexMode.SIMPLEX,
-        'copies': printTicketStore.copies.getValueAsNumber(),
-        'collate': printTicketStore.collate.getValue(),
+        'copies': 1,
+        'collate': true,
         'shouldPrintBackgrounds': printTicketStore.cssBackground.getValue(),
         'shouldPrintSelectionOnly': printTicketStore.selectionOnly.getValue()
       };
 
       // Set 'cloudPrintID' only if the destination is not local.
       if (destination && !destination.isLocal) {
         ticket['cloudPrintID'] = destination.id;
       }
 
       if (printTicketStore.marginsType.isCapabilityAvailable() &&
@@ skipping 696 matching lines @@
       return this.serializedAppStateStr_;
     }
   };
 
   // Export
   return {
     NativeInitialSettings: NativeInitialSettings,
     NativeLayer: NativeLayer
   };
 });