Boilerplate code to add chrome://syncfs-internals page for debugging.

chrome/browser/resources/sync_file_system_internals/main.css

Index: chrome/browser/resources/sync_file_system_internals/main.css
diff --git a/chrome/browser/resources/history/alert_overlay.css b/chrome/browser/resources/sync_file_system_internals/main.css
similarity index 46%
copy from chrome/browser/resources/history/alert_overlay.css
copy to chrome/browser/resources/sync_file_system_internals/main.css
index c843149f99d0bfb95e129a4a97381abd448561cc..6342e5a6cdcb98c7dfa242b35a563ddbd8ac46e5 100644
--- a/chrome/browser/resources/history/alert_overlay.css
+++ b/chrome/browser/resources/sync_file_system_internals/main.css
@@ -2,19 +2,13 @@
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file. */
 
-.overlay .page .button-strip > button {
-  min-width: 7em;
+th,
+td {
+  padding-left: 0.5em;
+  padding-right: 0.5em;
+  text-align: center;
 }
 
-.overlay {
-  z-index: 3;
+tr:nth-child(odd) {
+  background: rgb(238, 238, 255);
 }
-
-#alertOverlayMessage {
-  width: 400px;
-}
-
-#alertOverlayMessage {
-  white-space: pre-wrap;
-  word-wrap: break-word;
-}