Top-level pages should show left-navigation.

chrome/common/extensions/docs/templates/json/chrome_sidenav.json

 [
   {
     "title": "Devtools",
     "items": [
       {
         "title": "Learn Basics",
         "href": "/devtools/index",
         "items": [
           {
             "title": "Overview",
@@ skipping 387 matching lines @@
               },
               {
                 "title": "Keep Users Informed",
                 "href": "/apps/inform_users"
               },
               {
                 "title": "Cloud Messaging",
                 "href": "/apps/cloudMessaging"
               },
               {
+                "title": "Native Messaging",
+                "href": "/apps/nativeMessaging"
+              },  
+              {
                 "title": "Rich Notifications",
                 "href": "/apps/richNotifications"
               },
               {
                 "title": "User Authentication",
                 "href": "/apps/app_identity"
               }
             ]
           },
           {
@@ skipping 103 matching lines @@
               {
                 "title": "Stack Overflow",
                 "href": "http://stackoverflow.com/questions/tagged/google-chrome-app"
               }
             ]
           }
         ]
       },
       {
         "title": "Extensions",
-        "href": "/extensions/overview",
+        "href": "/extensions/index",
         "items": [
           {
             "title": "Learn Basics",
-            "href": "/extensions/overview",
+            "href": "/extensions/index",
             "items": [
               {
                 "title": "Overview",
                 "href": "/extensions/overview"
               },
               {
                 "title": "Hosting Changes",
                 "href": "/extensions/hosting_changes"
               },
               {
@@ skipping 49 matching lines @@
               },
               {
                 "title": "Internationalization",
                 "href": "/extensions/i18n"
               },
               {
                 "title": "Message Passing",
                 "href": "/extensions/messaging"
               },
               {
+                "title": "Native Messaging",
+                "href": "/extensions/nativeMessaging"
+              },
+              {
                 "title": "Migrate to Manifest 2",
                 "href": "/extensions/tut_migration_to_manifest_v2"
               },
               {
                 "title": "OAuth",
                 "href": "/extensions/tut_oauth"
               }
             ]
           },
           {
@@ skipping 75 matching lines @@
               {
                 "title": "Stack Overflow",
                 "href": "http://stackoverflow.com/tags/google-chrome-extension/info"
               }
             ]
           }
         ]
       },
       {
         "title": "Native Client",
-        "href": "/native-client/overview",
+        "href": "/native-client/index",
         "items": [
           {
             "title": "Learn Basics",
-            "href": "/native-client/overview",
+            "href": "/native-client/index",
             "items": [
               {
                 "title": "Technical Overview",
                 "href": "/native-client/overview"
               },
               {
                 "title": "NaCl and PNaCl",
                 "href": "/native-client/nacl-and-pnacl"
               }
             ]
@@ skipping 306 matching lines @@
                 "title": "Articles",
                 "href": "/webstore/articles"
               }
             ]
           }
         ]
       }
     ]
   }
 ]