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

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

 <link rel="import" href="chrome://resources/polymer/v1_0/polymer/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-icon/iron-icon.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-icons/av-icons.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-icons/communication-icons.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-icons/hardware-icons.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-icons/iron-icons.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-checkbox/paper-checkbox.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-item/paper-item.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-menu/paper-menu.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-spinner/paper-spinner.html">
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                     class$="[[computeSinkIconClass_(item.id, sinkToRouteMap_)]]">
                 </iron-icon>
                 <template is="dom-if"
                     if="[[computeSinkIsLaunching_(currentLaunchingSinkId_, item.id)]]">
                   <paper-spinner class="sink-icon" active>
                   </paper-spinner>
                 </template>
               </div>
               <div>
                 <div class="sink-text">
-                  <span dir="auto">[[item.name]]</span>
+                  <span dir="auto" class="sink-name" title="[[item.name]]">
+                    [[item.name]]
+                  </span>
                   <template is="dom-if"
                       if="[[!computeSinkDomainHidden_(item)]]">
-                    <span class="sink-domain">
+                    <span class="sink-domain" title="[[item.domain]]">
                       [[item.domain]]
                     </span>
                   </template>
                 </div>
                 <template is="dom-if"
                     if="[[!computeSinkSubtextHidden_(item, sinkToRouteMap_)]]">
                   <div class="sink-text sink-subtext">
                     <span>[[computeSinkSubtext_(item, sinkToRouteMap_)]]</span>
                   </div>
               </template>
               </div>
             </div>
           </paper-item>
         </template>
       </paper-menu>
     </div>
     <template is="dom-if"
         if="[[computeIssueBannerShown_(currentView_, issue)]]">
       <issue-banner id="issue-banner" issue="[[issue]]"
           class$="[[computeIssueBannerClass_(issue)]]"
           on-issue-action-click="showSinkList_">
       </issue-banner>
     </template>
   </template>
   <script src="media_router_container.js"></script>
 </dom-module>