Introduce concept of provisional destinations to print preview

chrome/browser/resources/print_preview/data/destination.js

Index: chrome/browser/resources/print_preview/data/destination.js
diff --git a/chrome/browser/resources/print_preview/data/destination.js b/chrome/browser/resources/print_preview/data/destination.js
index edce220a5ee90ffeeefcfb3a9a5f32978b014d4a..9648080350884de858fcb5bbe4512b1218cb74a7 100644
--- a/chrome/browser/resources/print_preview/data/destination.js
+++ b/chrome/browser/resources/print_preview/data/destination.js
@@ -56,6 +56,7 @@ cr.define('print_preview', function() {
    *          cloudID: (string|undefined),
    *          extensionId: (string|undefined),
    *          extensionName: (string|undefined),
+   *          usbId: (number | undefined),
    *          description: (string|undefined)}=} opt_params Optional parameters
    *     for the destination.
    * @constructor
@@ -167,6 +168,12 @@ cr.define('print_preview', function() {
      * @private {string}
      */
     this.extensionName_ = (opt_params && opt_params.extensionName) || '';
+
+    /** @private {Destination.ProvisionalType} */
+    this.provisionalType_ = Destination.ProvisionalType.NONE;
+
+    /** @private {?number} */
+    this.usbId_ = (opt_params && opt_params.usbId) || null;
   };
 
   /**
@@ -225,6 +232,11 @@ cr.define('print_preview', function() {
     UNREGISTERED: 'UNREGISTERED'
   };
 
+  Destination.ProvisionalType = {
+    NONE: 'NONE',
+    NEEDS_USB_PERMISSION: 'NEEDS_USB_PERMISSION'
+  };
+
   /**
    * Enumeration of relative icon URLs for various types of destinations.
    * @enum {string}
@@ -501,6 +513,32 @@ cr.define('print_preview', function() {
           this.extraPropertiesToMatch.some(function(property) {
             return property.match(query);
           });
+    },
+
+    /** @return {Destination.ProvisionalType} */
+    get provisionalType() {
+      return this.provisionalType_;
+    },
+
+    /** @param {Destination.ProvisionalType} type */
+    set provisionalType(type) {
+      if (type == Destination.ProvisionalType.NEDS_USB_PERMISSION) {
+        assert(this.extensionId != null,
+               'Provisional USB destination with no extension ID set.');
+        assert(this.usbId != null,
+               'Provisional USB destination with no USB ID set.');
+      }
+      this.provisionalType_ = type;
+    },
+
+    /** @return {boolean} */
+    get isProvisional() {
+      return this.provisionalType_ != Destination.ProvisionalType.NONE;
+    },
+
+    /** @return {?number} */
+    get usbId() {
+      return this.usbId_;
     }
   };