[MD settings] add custom spelling words to top of list

chrome/browser/resources/settings/languages_page/edit_dictionary_page.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.
 
 /**
  * @fileoverview 'settings-edit-dictionary-page' is a sub-page for editing
  * the "dictionary" of custom words used for spell check.
  */
 Polymer({
   is: 'settings-edit-dictionary-page',
@@ skipping 103 matching lines @@
   addWordFromInput_: function() {
     // Spaces are allowed, but removing leading and trailing whitespace.
     var word = this.newWordValue_.trim();
     this.newWordValue_ = '';
     if (!word)
       return;
 
     var index = this.words_.indexOf(word);
     if (index == -1) {
       this.languageSettingsPrivate.addSpellcheckWord(word);
-      this.push('words_', word);
-      index = this.words_.length - 1;
+      this.unshift('words_', word);
     }
-
-    // Scroll to the word (usually the bottom, or to the index if the word
-    // is already present).
-    this.async(function(){
-      this.root.querySelector('#list').scrollToIndex(index);
-    });
   },
 
   /**
    * Checks if any words exists in the dictionary.
    * @private
    * @return {boolean}
    */
   hasWords_: function() {
     return this.words_.length > 0;
   }
 });