helper script to update gitiles css

tools/md_browser/update-css.sh

Index: tools/md_browser/update-css.sh
diff --git a/tools/md_browser/update-css.sh b/tools/md_browser/update-css.sh
new file mode 100755
index 0000000000000000000000000000000000000000..cfb097e9fb1eaf247a0656c3733f00b174efeb66
--- /dev/null
+++ b/tools/md_browser/update-css.sh
@@ -0,0 +1,14 @@
+#!/bin/bash
+# Copyright 2017 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.
+
+URL_BASE='https://gerrit.googlesource.com/gitiles/+/HEAD/gitiles-servlet/src/main/resources/com/google/gitiles/static'
+
+# Quickly pull down the latest gitiles css files.
+for css in base doc prettify/prettify; do
+  output="${css#*/}.css"
+  url="${URL_BASE}/${css}.css?format=TEXT"
+  echo "Updating ${output}"
+  curl "${url}" | base64 -d >"${output}"
+done