[MD History] Add routing for synced devices page.

chrome/browser/resources/md_history/side_bar.js

Index: chrome/browser/resources/md_history/side_bar.js
diff --git a/chrome/browser/resources/md_history/side_bar.js b/chrome/browser/resources/md_history/side_bar.js
index 11da2e42884c0a1912b197769c89dd3733c4949b..6b01531d17da55540d002e7e0c90bd052fce15c0 100644
--- a/chrome/browser/resources/md_history/side_bar.js
+++ b/chrome/browser/resources/md_history/side_bar.js
@@ -9,6 +9,9 @@ Polymer({
     selectedPage: {
       type: String,
       notify: true
+    },
+    route: {
+      type: Object
     }
   },
 
@@ -20,5 +23,6 @@ Polymer({
   onSelect_: function(e) {
     this.fire('unselect-all');
     this.selectedPage = e.detail.item.getAttribute('view-id');
+    this.set('route.path', e.detail.item.getAttribute('href'));
   },
 });