Make cr.ui.Focus* play nice with Shadow DOM and MD chrome://downloads

chrome/browser/resources/md_downloads/item.js

 // Copyright 2015 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.
 
 cr.define('downloads', function() {
   var Item = Polymer({
     is: 'downloads-item',
 
     /**
      * @param {!downloads.ThrottledIconLoader} iconLoader
      * @param {!downloads.ActionService} actionService
      */
     factoryImpl: function(iconLoader, actionService) {
       /** @private {!downloads.ThrottledIconLoader} */
       this.iconLoader_ = iconLoader;
 
       /** @private {!downloads.ActionService} */
       this.actionService_ = actionService;
     },
 
     properties: {
       hideDate: {
         reflectToAttribute: true,
         type: Boolean,
         value: false,
       },
 
+      readyPromise: {
+        type: Object,
+        value: function() {
+          return new Promise(function(resolve, reject) {
+            this.resolveReadyPromise_ = resolve;
+          }.bind(this));
+        },
+      },
+
       scrollbarWidth: {
         type: Number,
         value: 0,
         observer: 'onScrollbarWidthChange_',
       },
 
       isDangerous_: {
         type: Boolean,
         value: false,
       },
 
       isIncognito_: {
         type: Boolean,
         value: false,
       },
 
       /** Only set when |isDangerous| is true. */
       isMalware_: Boolean,
     },
 
+    ready: function() {
+      this.content = this.$.content;
+      this.resolveReadyPromise_();
+    },
+
     /** @param {!downloads.Data} data */
     update: function(data) {
       assert(!this.id_ || data.id == this.id_);
       this.id_ = data.id;  // This is the only thing saved from |data|.
 
       this.isIncognito_ = data.otr;
 
       // Danger-independent UI and controls.
       var since = data.since_string;
       this.ensureTextIs_(this.$.since, since);
@@ skipping 65 matching lines @@
 
         hideRemove = showCancel ||
             !loadTimeData.getBoolean('allowDeletingHistory');
 
         /** @const */ var controlledByExtension = data.by_ext_id &&
                                                   data.by_ext_name;
         this.$['controlled-by'].hidden = !controlledByExtension;
         if (controlledByExtension) {
           var link = this.$['controlled-by'].querySelector('a');
           link.href = 'chrome://extensions#' + data.by_ext_id;
-          link.setAttribute('focus-type', 'controlled-by');
           link.textContent = data.by_ext_name;
         }
 
         var icon = 'chrome://fileicon/' + encodeURIComponent(data.file_path);
         this.iconLoader_.loadScaledIcon(this.$['file-icon'], icon);
       }
 
       this.$.remove.style.visibility = hideRemove ? 'hidden' : '';
     },
 
@@ skipping 127 matching lines @@
     },
 
     /** @private */
     onShowClick_: function() {
       this.actionService_.show(this.id_);
     },
   });
 
   return {Item: Item};
 });