[Media Router] Use common media-router-header for MR UI.

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

Index: chrome/browser/resources/media_router/elements/media_router_container/media_router_container.js
diff --git a/chrome/browser/resources/media_router/elements/media_router_container/media_router_container.js b/chrome/browser/resources/media_router/elements/media_router_container/media_router_container.js
index a94a0c4ec513393d4779e6453c97743a43ca3ed9..1e30beaaaddbf485b28f1d506ede1a828cf43623 100644
--- a/chrome/browser/resources/media_router/elements/media_router_container/media_router_container.js
+++ b/chrome/browser/resources/media_router/elements/media_router_container/media_router_container.js
@@ -100,6 +100,17 @@ Polymer({
     issue: {
       type: Object,
       value: null,
+      observer: 'maybeShowIssueView_',
+    },
+
+    /**
+     * The header text.
+     * @private {string}
+     */
+    issueHeaderText_: {
+      type: String,
+      readOnly: true,
+      value: loadTimeData.getString('issueHeader'),
     },
 
     /**
@@ -301,10 +312,15 @@ Polymer({
    */
   computeHeaderText_: function(view, headerText) {
     switch (view) {
-      case media_router.MediaRouterView.SINK_LIST:
-        return this.headerText;
       case media_router.MediaRouterView.CAST_MODE_LIST:
         return this.selectCastModeHeaderText_;
+      case media_router.MediaRouterView.ISSUE:
+        return this.issueHeaderText_;
+      case media_router.MediaRouterView.ROUTE_DETAILS:
+        return this.currentRoute_ ?
+            this.sinkMap_[this.currentRoute_.sinkId].name : '';
+      case media_router.MediaRouterView.SINK_LIST:
+        return this.headerText;
       default:
         return '';
     }
@@ -532,6 +548,17 @@ Polymer({
   },
 
   /**
+   * Updates |currentView_| if there is a new blocking issue.
+   *
+   * @param {?media_router.Issue} issue The new issue.
+   * @private
+   */
+  maybeShowIssueView_: function(issue) {
+    if (!!issue && issue.isBlocking)
+      this.currentView_ = media_router.MediaRouterView.ISSUE;
+  },
+
+  /**
    * Handles a cast mode selection. Updates |headerText|, |headerTextTooltip|,
    * and |selectedCastModeValue_|.
    *