Show an extension info bubble when a script badge is clicked.

chrome/browser/resources/extensions/extension_info.css

+/* Copyright (c) 2012 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. */
+
+body {
+  font-family: 'DejaVu Sans', Arial, sans-serif;
+  max-width: 480px;
+  min-width: 360px;
+}
+
+#extension-item {
+  background-repeat: no-repeat;
+  display: -webkit-box;
+  min-height: 48px;
+}
+
+#extension-title-running {
+  -webkit-padding-after: 5px;
+  -webkit-padding-end: 5px;
+  font-size: 14px;
+  font-weight: 500;
+}
+
+#extension-last-updated,
+#extension-update-time {
+  -webkit-padding-end: 7px;
+  color: rgb(78, 83, 86);
+  font-size: 13px;

[Evan Stade, 2012/06/21 18:56:22]

define fonts in em.

[Yoyo Zhou, 2012/06/21 21:38:05]

Done.

+  font-weight: 400;
+}
+
+#extension-description {
+  -webkit-padding-end: 5px;
+  color: rgb(121, 126, 130);
+  font-size: 13px;
+  margin: 5px 0;
+  white-space: normal;
+}
+
+#extension-details {
+  -webkit-box-flex: 1;
+  -webkit-padding-start: 57px;
+}