Truncate long file name with ellipsis.

ui/file_manager/gallery/css/gallery.css

 /* Copyright (c) 2014 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. */
 
 body {
   -webkit-user-select: none;
   font-size: 84%;
   margin: 0;
 }
 
@@ skipping 323 matching lines @@
 
 .filename-spacer {
   -webkit-margin-start: 16px;
   flex: 1 0 auto;
 }
 
 #rename-input {
   margin: 8px 0;
   min-width: 160px;
   padding: 4px 0;
+  text-overflow: ellipsis;
   width: -webkit-fit-content;
 }
 
 #rename-input > input {
   color: white;
 }
 
 /* Bubble */
 
 .gallery .toolbar .bubble {
@@ skipping 1007 matching lines @@
 .thumbnail-view .animation-thumbnail {
   background-repeat: no-repeat;
   background-size: cover;
   display: none;
   position: absolute;
 }
 
 .thumbnail-view .animation-thumbnail.animating {
   display: block;
 }