Add chrome://site-tiles-internals/

components/ntp_tiles/webui/resources/ntp_tiles_internals.css

Index: components/ntp_tiles/webui/resources/ntp_tiles_internals.css
diff --git a/components/ntp_tiles/webui/resources/ntp_tiles_internals.css b/components/ntp_tiles/webui/resources/ntp_tiles_internals.css
new file mode 100644
index 0000000000000000000000000000000000000000..6de21e508de614e0ebc325ef6a490c7338b5d660
--- /dev/null
+++ b/components/ntp_tiles/webui/resources/ntp_tiles_internals.css
@@ -0,0 +1,54 @@
+/* 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;
+}
+
+div.section {
+  width: 100%;
+  display: inline-block;
+  margin-left: auto;
+  margin-right: auto;
+}
+
+div.section.hidden {
+  display: none;
+}
+
+h2 {
+  color: rgb(74, 142, 230);
+  font-size: 100%;
+  margin-bottom: 0;
+}
+
+.err {
+  color: red;
+}
+
+.section-details {
+  width: 100%;
+}
+
+.section-details th {
+  background: rgb(239, 243, 255);
+}
+
+.section-details td {
+  vertical-align: top;
+}
+
+.section-details td.detail {
+  text-align: right;
+  width: 1px;
+  white-space: nowrap;
+}
+
+.section-details td.value input {
+  width: 100%;
+}
+
+#json-value {
+  font-size: 75%;
+}