Add Media Router route-details.

chrome/browser/resources/media_router/media_router_common.css

Index: chrome/browser/resources/media_router/media_router_common.css
diff --git a/chrome/browser/resources/media_router/media_router_common.css b/chrome/browser/resources/media_router/media_router_common.css
new file mode 100644
index 0000000000000000000000000000000000000000..00597408cd50f893084e96a6e9e117c01a809053
--- /dev/null
+++ b/chrome/browser/resources/media_router/media_router_common.css
@@ -0,0 +1,15 @@
+/* Copyright 2015 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. */
+
+button {
+  border: 1px solid rgb(193, 193, 195);
+  color: rgb(44, 44, 44);
+  cursor: pointer;
+  font-size: 1em;
+  font-weight: bold;
+  height: 32px;
+  overflow: hidden;
+  text-align: center;
+  width: 100%;
+}