Tests for Media Router media-router-container Polymer element.

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

Index: chrome/browser/resources/media_router/elements/media_router_container/media_router_container.html
diff --git a/chrome/browser/resources/media_router/elements/media_router_container/media_router_container.html b/chrome/browser/resources/media_router/elements/media_router_container/media_router_container.html
index cf10eb700d17352a770515d8c7357aaf731da0fa..8fa1714d0927b2f1951ea25bdb87876e6151ce7f 100644
--- a/chrome/browser/resources/media_router/elements/media_router_container/media_router_container.html
+++ b/chrome/browser/resources/media_router/elements/media_router_container/media_router_container.html
@@ -15,16 +15,16 @@
         class$="[[currentView_]]"
         hidden$="[[computeHeaderHidden_(currentView_, issue)]]">
       <div id="header-text">
-        <span
-            hidden$="[[computeSinkListViewHidden_(currentView_, issue)]]"
-            >[[headerText]]</span>
+        <span hidden$="[[computeSinkListViewHidden_(currentView_, issue)]]"
+            id="sink-list-header-text">[[headerText]]</span>
         <span hidden$="[[computeCastModeHidden_(currentView_)]]"
-            >[[selectCastModeHeaderText_]]</span>
+            id="cast-mode-header-text">[[selectCastModeHeaderText_]]</span>
       </div>
       <paper-icon-button icon="[[computeArrowDropIcon_(currentView_)]]"
-          on-click="toggleCastModeHidden_">
+          id="arrow-drop-icon" on-click="toggleCastModeHidden_">
       </paper-icon-button>
-      <paper-icon-button icon="close" on-click="onCloseButtonClick_">
+      <paper-icon-button icon="close" id="close-button"
+          on-click="onCloseButtonClick_">
       </paper-icon-button>
     </paper-toolbar>
     <issue-banner id="issue-banner" issue="[[issue]]"
@@ -51,7 +51,7 @@
    <!-- TODO(kdresner): Don't show this until we've given a little
     bit of time to actually discover devices. Maybe show a spinner
     during this time. -->
-    <div
+    <div id="sink-list-view"
         hidden$="[[computeSinkListViewHidden_(currentView_, issue)]]">
       <div id="device-missing"
            hidden$="[[!computeSinkListHidden_(sinkList)]]">