DevTools: jump from computed style to styles sidebar pane.

third_party/WebKit/Source/devtools/front_end/elements/computedStyleSidebarPane.css

 /*
  * Copyright (c) 2015 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.
  */
 
 .computed-properties {
     -webkit-user-select: text;
 }
 
 .computed-style-property {
     display: flex;
     flex-wrap: wrap;
 }
 
 .computed-style-property .property-name {
     width: 16em;
     text-overflow: ellipsis;
     overflow: hidden;
 }
 
 .computed-style-property .property-value {
     min-width: 5em;
+    position: relative;
+}
+
+.tree-outline li:hover .goto-source-icon {
+    display: block;
+}
+
+.goto-source-icon {
+    -webkit-mask-image: url(Images/toolbarButtonGlyphs.png);
+    -webkit-mask-position: 0 -120px;
+    background-color: #5a5a5a;
+    width: 28px;
+    height: 24px;
+    display: none;
+    position: absolute;
+    top: -6px;
+    left: -27px;
+    transform: scale(0.8);
+}
+
+.goto-source-icon:hover {
+    background-color: #333;
 }
 
 .computed-style-property-inherited {
     opacity: 0.5;
 }
 
 .trace-link {
     float: right;
     padding-left: 1em;
     position: relative;
@@ skipping 12 matching lines @@
 }
 
 .property-trace-selector {
     color: gray;
     padding-left: 2em;
 }
 
 .property-trace-value {
     position: relative;
     display: inline-block;
+    margin-left: 2em;
 }
 
 .property-trace-inactive .property-trace-value::before {
     position: absolute;
     content: ".";
     border-bottom: 1px solid rgba(0, 0, 0, 0.35);
     top: 0;
     bottom: 5px;
     left: 0;
     right: 0;
@@ skipping 17 matching lines @@
     margin-left: 4px;
 }
 
 .delimeter {
     color: transparent;
 }
 
 .delimeter::selection {
     color: transparent;
 }