Update CUPS settings UI to allow USB printers to be added via discovery.

chrome/browser/resources/settings/printing_page/cups_add_printer_dialog.html

Index: chrome/browser/resources/settings/printing_page/cups_add_printer_dialog.html
diff --git a/chrome/browser/resources/settings/printing_page/cups_add_printer_dialog.html b/chrome/browser/resources/settings/printing_page/cups_add_printer_dialog.html
index 867ac2c9afabe2f0c7f0263862122e8af716bdc9..602ae63269e0bbbda02b6e544c5ef71e39d0ef78 100644
--- a/chrome/browser/resources/settings/printing_page/cups_add_printer_dialog.html
+++ b/chrome/browser/resources/settings/printing_page/cups_add_printer_dialog.html
@@ -75,7 +75,7 @@
           </paper-button>
           <paper-button class="action-button" id="addPrinterButton"
               disabled="[[!selectedPrinter]]"
-              on-tap="switchToConfiguringDialog_">
+              on-tap="switchToManufacturerDialog_">
             $i18n{addPrinterButtonText}
           </paper-button>
         </div>
@@ -317,8 +317,8 @@
       <div class="dialog-buttons">
         <div>  <!-- Left group -->
           <paper-button id="manuallyAddPrinterButton" class="secondary-button"
-              on-tap="switchToManualAddDialog_">
-            $i18n{manuallyAddPrinterButtonText}
+              on-tap="switchToPreviousDialog_">
+            $i18n{back}
           </paper-button>
         </div>
         <div>  <!-- Right group -->
@@ -366,7 +366,7 @@
 
     <!-- Printer Discovery Dialog -->
     <template is="dom-if" if="[[showDiscoveryDialog_]]" restamp>
-      <add-printer-discovery-dialog selected-printer="{{selectedPrinter}}">
+      <add-printer-discovery-dialog selected-printer="{{newPrinter}}">
       </add-printer-discovery-dialog>
     </template>
 
@@ -387,7 +387,7 @@
     <!-- Manufacturer and Model Dialog -->
     <template is="dom-if" if="[[showManufacturerDialog_]]" restamp>
       <add-printer-manufacturer-model-dialog new-printer="{{newPrinter}}"
-          setup-failed="[[setupFailed]]">
+          previous-dialog="[[previousDialog]]" setup-failed="[[setupFailed]]">
       </add-printer-manufacturer-model-dialog>
     </template>