[MD Bookmarks] Support elision of bookmark names in the bookmark toast.

chrome/browser/resources/md_bookmarks/toast_manager.js

 // Copyright 2017 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 Element which shows toasts.
  */
 cr.define('bookmarks', function() {
 
   var ToastManager = Polymer({
@@ skipping 33 matching lines @@
     /** @override */
     detached: function() {
       ToastManager.instance_ = null;
     },
 
     /**
      * @param {string} label The label to display inside the toast.
      * @param {boolean} showUndo Whether the undo button should be shown.
      */
     show: function(label, showUndo) {
+      this.$.content.textContent = label;
+      this.showInternal_(showUndo);
+    },
+
+    /**
+     * Shows the toast, making certain text fragments collapsible.
+     * @param {!Array<!{value: string, collapsible: boolean}>} pieces
+     * @param {boolean} showUndo Whether the undo button should be shown.
+     */
+    showForStringPieces: function(pieces, showUndo) {
+      var content = this.$.content;
+      content.textContent = '';
+      pieces.forEach(function(p) {
+        if (p.value.length == 0)
+          return;
+
+        var span = document.createElement('span');
+        span.textContent = p.value;
+        if (p.collapsible)
+          span.classList.add('collapsible');
+
+        content.appendChild(span);
+      });
+
+      this.showInternal_(showUndo);
+    },
+
+    /**
+     * @param {boolean} showUndo Whether the undo button should be shown.
+     * @private
+     */
+    showInternal_: function(showUndo) {
       this.open_ = true;
-      // TODO(calamity): Support collapsing of long bookmark names in label.
-      this.$.content.textContent = label;
       this.showUndo_ = showUndo;
 
       if (!this.duration)
         return;
 
       if (this.hideTimeout_ != null) {
         this.clearTimeout_(this.hideTimeout_);
         this.hideTimeout_ = null;
       }
 
@@ skipping 19 matching lines @@
 
   /** @return {!bookmarks.ToastManager} */
   ToastManager.getInstance = function() {
     return assert(ToastManager.instance_);
   };
 
   return {
     ToastManager: ToastManager,
   };
 });