Allow dumping raw json fetched from the server.

chrome/browser/resources/snippets_internals.css

 /* Copyright 2016 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 {
   font-size: 20px;
 }
 
 textarea {
   width: 100%;
 }
 
 #info > div {
   width: 100%;
 }
 
 #info h2 {
   color: rgb(74, 142, 230);
   font-size: 100%;
   margin-bottom: 0.3em;
   margin-top: 1em;
 }
 
-#info .section {
-  display: inline-block;
-  margin-left: auto;
-  margin-right: auto;
-}
-
 .section-details {
   width: 100%;
 }
 
+.section-details > tbody > tr:nth-child(odd) {
+  background: rgb(239, 243, 255);
+}
+
 .section-details .detail,
 .section-details .value {
   width: 50%;
 }
 
 td.title-link {
   padding-bottom: 0.5em;
   padding-top: 0.5em;
 }
 
 .expiry {
   color: gray;
   font-size: 80%;
 }
 
 .date {
   white-space: nowrap;
 }
 
 .url {
   display: inline-block;
   font-size: 80%;
   word-break: break-all;
 }
 
 .snippet-detail {
   font-size: 90%;
 }
 
-.snippet-hidden {
+.hidden {
   display: none;
 }
 
-table.section-details > tbody > tr:nth-child(odd) {
-  background: rgb(239, 243, 255);
-}
-
 .detail {
   color: gray;
   font-weight: normal;
 }
 
 .forms {
   margin-top: 0.3em;
 }
 
 #submit-clear {
   margin-bottom: 0.5em;
+}
+
+#last-json-text {
+  border: 1px solid black;
+  color: gray;
+  font-size: 90%;
+  padding: 4px;
 }