Add back button to chrome://devices

chrome/browser/resources/local_discovery/local_discovery.js

Index: chrome/browser/resources/local_discovery/local_discovery.js
diff --git a/chrome/browser/resources/local_discovery/local_discovery.js b/chrome/browser/resources/local_discovery/local_discovery.js
index 6d2ae436c0f3d2ddaa777e0f14cb765594d90095..b7e265a47913ddd47aab9664fdadd528988e7a8a 100644
--- a/chrome/browser/resources/local_discovery/local_discovery.js
+++ b/chrome/browser/resources/local_discovery/local_discovery.js
@@ -605,6 +605,13 @@ cr.define('local_discovery', function() {
       'click',
       registerOverlayLoginButtonClicked);
 
+    if (loadTimeData.valueExists('backButtonURL')) {
+      $('back-button').hidden = false;
+      $('back-button').addEventListener('click', function() {
+        window.location.href = loadTimeData.getString('backButtonURL');
+      });
+    }
+
     updateVisibility();
     document.addEventListener('visibilitychange', updateVisibility, false);