DevTools: Add "New" button to launch timeline landing page.

third_party/WebKit/Source/devtools/front_end/ui/toolbar.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.
  */
 
 :host {
     flex: none;
     padding: 0 2px;
 }
@@ skipping 69 matching lines @@
     overflow: hidden;
     text-align: right;
     color: #333 !important;
 }
 
 .toolbar-button .toolbar-dropdown-arrow {
     background-color: #333 !important;
 }
 
 .toolbar-has-glyph .toolbar-text {
-    margin-left: 0;
+    margin-left: -4px;
 }
 
 .toolbar-button:not(.toolbar-has-glyph):not(.toolbar-has-dropdown):not(.largeicon-menu) {
     font-weight: bold;
 }
 
 .toolbar-render-as-links * {
     font-weight: initial;
     color: rgb(17, 85, 204);
     text-decoration: underline;
@@ skipping 145 matching lines @@
     margin-top: -1px;
     width: 28px;
     left: -2px;
 }
 
 span.toolbar-select-container.toolbar-item.warning {
     background: #ffd7d7;
     padding: 0 5px 0 0;
     margin-right: 1px;
 }