MD Downloads: announce search results

chrome/browser/resources/md_downloads/toolbar.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 Toolbar = Polymer({
     is: 'downloads-toolbar',
 
     properties: {
       downloadsShowing: {
         reflectToAttribute: true,
         type: Boolean,
         value: false,
         observer: 'downloadsShowingChanged_',
       },
 
       spinnerActive: {
         type: Boolean,
         notify: true,
       },
     },
 
     /** @return {boolean} Whether removal can be undone. */
     canUndo: function() {
       return !this.$.toolbar.getSearchField().isSearchFocused();
     },
 
     /** @return {boolean} Whether "Clear all" should be allowed. */
     canClearAll: function() {
-      return !this.$.toolbar.getSearchField().getValue() &&
-          this.downloadsShowing;
+      return this.getSearchText().length == 0 && this.downloadsShowing;
+    },
+
+    /** @return {string} The full text being searched. */
+    getSearchText: function() {
+      return this.$.toolbar.getSearchField().getValue();
     },
 
     onFindCommand: function() {
       this.$.toolbar.getSearchField().showAndFocus();
     },
 
     /** @private */
     downloadsShowingChanged_: function() {
       this.updateClearAll_();
     },
@@ skipping 28 matching lines @@
     },
 
     /** @private */
     updateClearAll_: function() {
       this.$$('.clear-all').hidden = !this.canClearAll();
     },
   });
 
   return {Toolbar: Toolbar};
 });