[MD Extensions] Add a details subpage, move to one list

chrome/browser/resources/md_extensions/service.js

Index: chrome/browser/resources/md_extensions/service.js
diff --git a/chrome/browser/resources/md_extensions/service.js b/chrome/browser/resources/md_extensions/service.js
index a0837206eb1194c7e7329a87b1ca9a7552dcfbe4..b0216b426027e4119514e4328af9ca99891cb649 100644
--- a/chrome/browser/resources/md_extensions/service.js
+++ b/chrome/browser/resources/md_extensions/service.js
@@ -111,7 +111,12 @@ cr.define('extensions', function() {
     },
 
     /** @override */
-    showItemDetails: function(id) {},
+    showItemDetails: function(id) {
+      var data =
+          this.extensions_.filter(function(e) { return e.id === id; })[0];
+      assert(data);
+      this.manager_.showDetailsFor(data);
+    },
 
     /** @override */
     setItemAllowedIncognito: function(id, isAllowedIncognito) {