Enable chrome://gcm-internals on Android

components/gcm_driver/resources/gcm_internals.css

 /* Copyright 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. */
 
 h1 {
   color: rgb(74, 142, 230);
   margin: 0;
   padding: 0;
 }
 
 td {
   padding: 4px;
 }
 
 tr:nth-child(odd) {
   background-color: rgb(245, 245, 200);
 }
 
 th {
   background-color: rgb(160, 160, 125);
   color: rgb(255, 255, 255);
   font-weight: bold;
 }
 
 .flexbar {
   display: flex;
   flex-direction: row;
-  margin: 5px;
+  margin: 5px 0px;
+}
+
+.flexbar button {
+  padding: 0px 4px;
 }
 
 #device-info tr :first-child {
   font-weight: bold;
   padding-right: 10px;
   text-align: end;
 }
 
 .log-table {
   padding: 4px;
 }