chrome/browser/resources/settings/printing_page/printing_browser_proxy.js

// Copyright 2017 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.

/**
 * @fileoverview A helper object used from the Chrome printing section to
 * interact with the browser. Used on operating system that is not Chrome OS.
 */

// clang-format off
import {addSingletonGetter} from 'chrome://resources/js/cr.m.js';
// clang-format on

  /** @interface */
  class PrintingBrowserProxy {
    /**
     * Open the native print system dialog.
     */
    openSystemPrintDialog() {}
  }

  /**
   * @implements {PrintingBrowserProxy}
   */
  export class PrintingBrowserProxyImpl {
    /** @override */
    openSystemPrintDialog() {
      chrome.send('openSystemPrintDialog');
    }
  }

  addSingletonGetter(PrintingBrowserProxyImpl);