Making touch target wider (35px) for the splitter in bookmark manager

chrome/browser/resources/bookmark_manager/css/bmm.css

 /* 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. */
 
 html,
 body {
   cursor: default;
   height: 100%;
   margin: 0;
   overflow: hidden;
@@ skipping 192 matching lines @@
 
 .main {
   -webkit-flex: 1;
   display: -webkit-flex;
   /* TODO(arv): Remove min-height once bug is fixed:
    * https://bugs.webkit.org/show_bug.cgi?id=111790 */
   min-height: 0;
 }
 
 #tree-container {
-  -webkit-padding-end: 5px;
-  -webkit-padding-start: 10px;
+  -webkit-padding-start: 15px;
   box-sizing: border-box;
   /* min-width and max-width are used by the split pane. */
   max-width: 50%;
   min-width: 50px;
   overflow: auto;
   padding-bottom: 5px;
   padding-top: 5px;
   width: 200px;
 }
 
 #tree {
   display: inline-block;
   min-width: 100%;
   overflow: visible; /* let the container do the scrolling */
 }
 
 .tree-item > .tree-row {
   line-height: 20px;
 }
 
 .tree-row .expand-icon {
   top: 2px;
 }
 
 #list {
   -webkit-flex: 1;
+  -webkit-padding-end: 5px;
   box-sizing: border-box;
   /* TODO(arv): Remove min-width once bug is fixed:
    * https://bugs.webkit.org/show_bug.cgi?id=111790 */
   min-width: 0;
-  padding: 5px;
+  padding-bottom: 5px;
+  padding-top: 5px;
 }
 
 .splitter {
   background-color: rgb(235, 239, 249);
+  border-left: 15px solid white;

[Evan Stade, 2013/04/04 02:37:57]

why white and not transparent?

+  border-right: 15px solid white;
   cursor: e-resize;
   width: 5px;
 <if expr="is_macosx">
   cursor: col-resize;
 </if>
 }
 
 .logo {
   -webkit-appearance: none;
   background: url('../images/bookmarks_section_32.png') no-repeat 50% 50%;
@@ skipping 104 matching lines @@
 
   list [editing] input,
   .tree-item [editing] input {
     padding: 3px 0;
   }
 
   .tree-row .expand-icon {
     top: 6px;
   }
 }