[Media Router] Show user email in header if cloud sink is present.

chrome/browser/resources/media_router/elements/media_router_header/media_router_header.css

 /* 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. */
 
 #arrow-drop-container {
   flex-grow: 1;
 }
 
 #arrow-drop-icon::shadow #icon {
   height: 20px;
@@ skipping 28 matching lines @@
   display: flex;
 }
 
 #header-text {
   -webkit-padding-end: 4px;
   color: white;
   font-size: 1.175em;
   margin: 0;
 }
 
+#user-email-container {

[apacible, 2016/02/13 08:13:02]

nit: alphabetize by selectors.

[amp, 2016/02/16 22:19:12]

Done.  I thought this included the '#' in the alphabetization, but this file was
tricky in that it worked either way until my addition here. :)

+  -webkit-padding-start: 12px;
+  font-size: 0.917em;
+  padding-bottom: 12px;
+}
+
 paper-icon-button {
   display: inline;
 }
 
 paper-toolbar {
   -webkit-padding-start: 8px;
   height: 52px;
 }
 
 paper-toolbar::shadow .toolbar-tools {
   padding: 0;
 }
 
 paper-toolbar.cast-mode-list {
   background-color: rgb(0, 150, 136);
 }
 
 paper-toolbar.filter {
   background-color: rgb(103, 58, 183);
 }
 
 paper-toolbar.issue {
   background-color: rgb(219, 68, 55);
 }
 
 paper-toolbar.route-details,
 paper-toolbar.sink-list {
   background-color: rgb(33, 150, 243);
 }