Introduce concept of provisional destinations to print preview

chrome/browser/resources/print_preview/native_layer.js

Index: chrome/browser/resources/print_preview/native_layer.js
diff --git a/chrome/browser/resources/print_preview/native_layer.js b/chrome/browser/resources/print_preview/native_layer.js
index 8c72a538284ac3e98bdaeda005022f06bf5b9754..621670a2e6d11a7eeeb88ab15776da69b3aa5113 100644
--- a/chrome/browser/resources/print_preview/native_layer.js
+++ b/chrome/browser/resources/print_preview/native_layer.js
@@ -67,6 +67,10 @@ cr.define('print_preview', function() {
         this.onEnableManipulateSettingsForTest_.bind(this);
     global.printPresetOptionsFromDocument =
         this.onPrintPresetOptionsFromDocument_.bind(this);
+    global.onProvisionalDestinationResolved =
+        this.onProvisionalDestinationResolved_.bind(this);
+    global.failedToResolveProvisionalDestination =
+        this.failedToResolveProvisionalDestination_.bind(this);
   };
 
   /**
@@ -106,6 +110,8 @@ cr.define('print_preview', function() {
     EXTENSION_CAPABILITIES_SET:
         'print_preview.NativeLayer.EXTENSION_CAPABILITIES_SET',
     PRINT_PRESET_OPTIONS: 'print_preview.NativeLayer.PRINT_PRESET_OPTIONS',
+    EXTENSION_USB_PRINTER_RESOLVED:
+        'print_preview.NativeLayer.EXTENSION_USB_PRINTER_RESOLVED'
   };
 
   /**
@@ -214,6 +220,17 @@ cr.define('print_preview', function() {
     },
 
     /**
+     * @param {string} provisionalDestinationId
+     * @param {string} extensionId
+     * @param {!number} usbId
+     */
+    grantUsbExtensionPermission:
+        function(provisionalDestinationId, extensionId, usbId) {
+      chrome.send('grantExtensionUsbPrinterAccess',
+                  [provisionalDestinationId, extensionId, usbId]);
+    },
+
+    /**
      * @param {!print_preview.Destination} destination Destination to print to.
      * @param {!print_preview.ticket_items.Color} color Color ticket item.
      * @return {number} Native layer color model.
@@ -529,6 +546,23 @@ cr.define('print_preview', function() {
       this.dispatchEvent(getCapsFailEvent);
     },
 
+    failedToResolveProvisionalDestination_: function(provisionalDestinationId) {
+      var evt = new Event(
+          NativeLayer.EventType.EXTENSION_USB_PRINTER_RESOLVED);
+      evt.provisionalId = provisionalDestinationId;
+      evt.destination = null;
+      this.dispatchEvent(evt);
+    },
+
+    onProvisionalDestinationResolved_: function(provisionalDestinationId,
+                                                destinationInfo) {
+      var evt = new Event(
+          NativeLayer.EventType.EXTENSION_USB_PRINTER_RESOLVED);
+      evt.provisionalId = provisionalDestinationId;
+      evt.destination = destinationInfo;
+      this.dispatchEvent(evt);
+    },
+
     /**
      * Called when native layer gets settings information for a requested privet
      * destination.