[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 17 matching lines @@
   height: 15px;
   width: 15px;
 }
 
 #close-button-container {
   -webkit-margin-start: auto;
   -webkit-padding-end: 16px;
   -webkit-padding-start: 24px;
 }
 
+#user-email-container {

[apacible, 2016/02/11 17:09:14]

nit: alphabetize by selectors

[amp, 2016/02/11 21:21:24]

Done.

+  -webkit-padding-start: 12px;
+  font-size: 0.917em;
+  padding-bottom: 12px;
+}
+
 #header-and-arrow-container {
   display: flex;
 }
 
 #header-text {
   -webkit-padding-end: 4px;
   color: white;
   font-size: 1.175em;
   margin: 0;
 }
@@ skipping 20 matching lines @@
 }
 
 paper-toolbar.issue {
   background-color: rgb(219, 68, 55);
 }
 
 paper-toolbar.route-details,
 paper-toolbar.sink-list {
   background-color: rgb(33, 150, 243);
 }