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

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

Index: chrome/browser/resources/media_router/elements/media_router_header/media_router_header.html
diff --git a/chrome/browser/resources/media_router/elements/media_router_header/media_router_header.html b/chrome/browser/resources/media_router/elements/media_router_header/media_router_header.html
index 621cf998d7ac3419cbdb056f9ad2f4e0a81761c8..7e7da114b6117af2cc66d57a12f1e2751dbde040 100644
--- a/chrome/browser/resources/media_router/elements/media_router_header/media_router_header.html
+++ b/chrome/browser/resources/media_router/elements/media_router_header/media_router_header.html
@@ -5,7 +5,7 @@
   <link rel="import" type="css" href="../../media_router_common.css">
   <link rel="import" type="css" href="media_router_header.css">
   <template>
-    <paper-toolbar class$="[[view]]">
+    <paper-toolbar id="header-toolbar" class$="[[view]]">
       <div id="back-button-container">
         <paper-icon-button id="back-button" icon="[[arrowDropIcon_]]"
             on-click="onBackButtonClick_"
@@ -27,6 +27,11 @@
             on-click="onCloseButtonClick_">
         </paper-icon-button>
       </div>
+      <template is="dom-if" if="[[showEmail]]">
+        <div id="user-email-container" class="bottom fit">
+          <span title="[[userEmail]]">[[userEmail]]</span>

[imcheng, 2016/02/17 00:51:08]

is title needed?

[amp, 2016/02/17 02:11:37]

Not sure.  I assumed it was for accessibility as we also use a title on the
header text (line 16).  But as the text is the same here perhaps it doesn't make
a difference?

+        </div>
+      </template>
     </paper-toolbar>
   </template>
 <script src="media_router_header.js"></script>