Cleanup Tool WebUI: Add functionality to the Scan button

chrome/browser/resources/cleanup_tool/cleanup_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 Helper object and related behavior that encapsulate messaging
  * between JS and C++ for interacting with the Chrome Cleanup Tool.
  */
 
 /**
  * @typedef {{
  *   hasScanResults: boolean,
  *   isInfected: boolean,
  *   detectionStatusText: string,
  *   detectionTimeText: string,
  * }}
  */
 var LastScanResult;
 
 cr.define('cleanup', function() {
   /** @interface */
   function CleanupBrowserProxy() {}
 
   CleanupBrowserProxy.prototype = {
     /**
      * Fetch the result of the latest Chrome Cleanup Tool scanning task.
      * @return {!Promise<LastScanResult>}
      */
     requestLastScanResult: function() {},
+    /**
+     * Attempts to run the Chrome Cleanup Tool in scanning mode.
+     * @return {!Promise<LastScanResult>}
+     */
+    startScan: function() {},
   };
 
   /**
    * @constructor
    * @implements {cleanup.CleanupBrowserProxy}
    */
   function CleanupBrowserProxyImpl() {}
   cr.addSingletonGetter(CleanupBrowserProxyImpl);
 
   CleanupBrowserProxyImpl.prototype = {
     /** @override */
     requestLastScanResult: function() {
       return cr.sendWithPromise('requestLastScanResult');
     },
+    /** @override */
+    startScan: function() {
+      return cr.sendWithPromise('startScan');
+    },
   };
 
   return {
     CleanupBrowserProxy: CleanupBrowserProxy,
     CleanupBrowserProxyImpl: CleanupBrowserProxyImpl,
   }
 });