List printers managed by extensions in print preview

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

Index: chrome/browser/resources/print_preview/data/app_state.js
diff --git a/chrome/browser/resources/print_preview/data/app_state.js b/chrome/browser/resources/print_preview/data/app_state.js
index a8ebb063211d45d464fdf8e551720a35aec74ab7..6d90373446b6543063b1d4b735cf759ca27f500d 100644
--- a/chrome/browser/resources/print_preview/data/app_state.js
+++ b/chrome/browser/resources/print_preview/data/app_state.js
@@ -39,6 +39,7 @@ cr.define('print_preview', function() {
     SELECTED_DESTINATION_ORIGIN: 'selectedDestinationOrigin',
     SELECTED_DESTINATION_CAPABILITIES: 'selectedDestinationCapabilities',
     SELECTED_DESTINATION_NAME: 'selectedDestinationName',
+    SELECTED_DESTINATION_EXTENSION_ID: 'selectedDestinationExtensionId',
     IS_GCP_PROMO_DISMISSED: 'isGcpPromoDismissed',
     DPI: 'dpi',
     MEDIA_SIZE: 'mediaSize',
@@ -99,6 +100,13 @@ cr.define('print_preview', function() {
       return this.state_[AppState.Field.SELECTED_DESTINATION_NAME];
     },
 
+    /**
+     * @return {?string} Extension ID associated with the selected destination.
+     */
+    get selectedDestinationExtensionId() {
+      return this.state_[AppState.Field.SELECTED_DESTINATION_EXTENSION_ID];
+    },
+
     /** @return {boolean} Whether the GCP promotion has been dismissed. */
     get isGcpPromoDismissed() {
       return this.state_[AppState.Field.IS_GCP_PROMO_DISMISSED];
@@ -193,6 +201,8 @@ cr.define('print_preview', function() {
       this.state_[AppState.Field.SELECTED_DESTINATION_CAPABILITIES] =
           dest.capabilities;
       this.state_[AppState.Field.SELECTED_DESTINATION_NAME] = dest.displayName;
+      this.state_[AppState.Field.SELECTED_DESTINATION_EXTENSION_ID] =
+          dest.extensionId;
       this.persist_();
     },