MD Downloads: use "big search" box like MD history

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,
+      },
     },
 
     listeners: {
       'paper-dropdown-close': 'onPaperDropdownClose_',
       'paper-dropdown-open': 'onPaperDropdownOpen_',
     },
 
     /** @return {boolean} Whether removal can be undone. */
     canUndo: function() {
-      return this.$['search-input'] != this.shadowRoot.activeElement;
+      return !this.$.toolbar.getSearchField().isSearchFocused();
     },
 
     /** @return {boolean} Whether "Clear all" should be allowed. */
     canClearAll: function() {
-      return !this.$['search-input'].getValue() && this.downloadsShowing;
+      return !this.$.toolbar.getSearchField().getValue() &&
+          this.downloadsShowing;
     },
 
     onFindCommand: function() {
-      this.$['search-input'].showAndFocus();
+      this.$.toolbar.getSearchField().showAndFocus();
     },
 
     /** @private */
     closeMoreActions_: function() {
       this.$.more.close();
     },
 
     /** @private */
     downloadsShowingChanged_: function() {
       this.updateClearAll_();
@@ skipping 28 matching lines @@
     onPaperDropdownOpen_: function() {
       this.boundClose_ = this.boundClose_ || this.closeMoreActions_.bind(this);
       window.addEventListener('resize', this.boundClose_);
     },
 
     /**
      * @param {!CustomEvent} event
      * @private
      */
     onSearchChanged_: function(event) {
-      downloads.ActionService.getInstance().search(
-          /** @type {string} */ (event.detail));
+      var actionService = downloads.ActionService.getInstance();
+      actionService.search(/** @type {string} */ (event.detail));
+      this.spinnerActive = actionService.isSearching();
       this.updateClearAll_();
     },
 
     /** @private */
     onOpenDownloadsFolderTap_: function() {
       downloads.ActionService.getInstance().openDownloadsFolder();
     },
 
     /** @private */
     updateClearAll_: function() {
-      this.$$('#actions .clear-all').hidden = !this.canClearAll();
       this.$$('paper-menu .clear-all').hidden = !this.canClearAll();
     },
   });
 
   return {Toolbar: Toolbar};
 });