Display active media players on chrome://media-internals.

chrome/browser/resources/media_internals/media_internals.css

 /* Copyright (c) 2011 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.
  */
 
-h2 {
-  margin: 15px 0px 5px 0px;
+body {
+  font-family: sans-serif;
 }
 
-ul, p {
-  margin: 0px;
+h2 {
+  margin: 15px 0 5px 0;
+}
+
+ul, p, canvas {
+  margin: 0;
+}
+
+#media-players td, #media-players th {
+  padding: 0 10px;
 }
 
 .audio-stream[status='created'] {
   color: blue;
 }
 
 .audio-stream[status='closed'] {
   text-decoration: line-through;
 }
 
 .audio-stream[status='error'] {
   color: red;
 }
 
-#cache-entries ul {
+#cache-entries ul, #media-players ul {
   list-style-type: none;
 }
 
 .cache-entry {
-  margin: 0px 0px 5px 0px;
+  margin: 0 0 5px 0;
 }
 
 .cache-entry-controls {
   font-size: smaller;
 }
 
-.cache-entry summary {
+summary {
   text-indent: -1em;
 }
 
 .cache-table {
   table-layout: fixed;
   width: 500px;
 }
 
-.cache-table thead {
+thead {
   text-align: left;
 }
 
-.cache-table tfoot {
+tfoot {
   text-align: right;
 }
+
+.buffer-canvas {
+  margin-bottom: -3px;
+}