Add <a is="action-link">, a web component extension of <a> for in-page actions.

ui/webui/resources/js/util.js

 // Copyright (c) 2012 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.
 
 <include src="assert.js">
 
 /**
  * Alias for document.getElementById.
  * @param {string} id The ID of the element to find.
  * @return {HTMLElement} The found element or null if not found.
@@ skipping 209 matching lines @@
   };
 
   // Disable dragging.
   document.ondragstart = function(e) {
     if (!(opt_allowDragStart && opt_allowDragStart.call(this, e)))
       e.preventDefault();
   };
 }
 
 /**
+ * TODO(dbeam): DO NOT USE. THIS IS DEPRECATED. Use an action-link instead.
  * Call this to stop clicks on <a href="#"> links from scrolling to the top of
  * the page (and possibly showing a # in the link).
  */
 function preventDefaultOnPoundLinkClicks() {
   document.addEventListener('click', function(e) {
     var anchor = findAncestor(/** @type {Node} */(e.target), function(el) {
       return el.tagName == 'A';
     });
     // Use getAttribute() to prevent URL normalization.
     if (anchor && anchor.getAttribute('href') == '#')
@@ skipping 191 matching lines @@
  * @param {number} maxLength The maximum length allowed for the string.
  * @return {string} The original string if its length does not exceed
  *     |maxLength|. Otherwise the first |maxLength| - 1 characters with '...'
  *     appended.
  */
 function elide(original, maxLength) {
   if (original.length <= maxLength)
     return original;
   return original.substring(0, maxLength - 1) + '\u2026';
 }