added section to profile/preferences

app/assets/javascripts/dispatcher.js

@@ -55,6 +55,7 @@ import RefSelectDropdown from './ref_select_dropdown';
 import GfmAutoComplete from './gfm_auto_complete';
 import ShortcutsBlob from './shortcuts_blob';
 import initSettingsPanels from './settings_panels';
+import initExperimentalFlags from './experimental_flags';
 
 (function() {
   var Dispatcher;
@@ -120,6 +121,9 @@ import initSettingsPanels from './settings_panels';
       }
 
       switch (page) {
+        case 'profiles:preferences:show':
+          initExperimentalFlags();
+          break;
         case 'sessions:new':
           new UsernameValidator();
           new ActiveTabMemoizer();

app/assets/javascripts/experimental_flags.js

+import Cookies from 'js-cookie';
+
+export default () => {
+  $('.js-expirement-feature-toggle').on('change', (e) => {
+    const el = e.target;
+
+    Cookies.set(el.name, el.value, {
+      expires: 365 * 10,
+    });
+  });
+};

app/views/layouts/header/_default.html.haml

@@ -74,6 +74,8 @@
                     = link_to "Profile", current_user, class: 'profile-link', data: { user: current_user.username }
                   %li
                     = link_to "Settings", profile_path
+                  %li
+                    = link_to "Turn on new nav", profile_preferences_path(anchor: "new-navigation")
                   %li.divider
                   %li
                     = link_to "Sign out", destroy_user_session_path, method: :delete, class: "sign-out-link"

app/views/layouts/header/_new.html.haml

@@ -74,6 +74,8 @@
                     = link_to "Profile", current_user, class: 'profile-link', data: { user: current_user.username }
                   %li
                     = link_to "Settings", profile_path
+                  %li
+                    = link_to "Turn off new nav", profile_preferences_path(anchor: "new-navigation")
                   %li.divider
                   %li
                     = link_to "Sign out", destroy_user_session_path, method: :delete, class: "sign-out-link"

app/views/profiles/preferences/show.html.haml

@@ -17,6 +17,24 @@
         = scheme.name
   .col-sm-12
     %hr
+  .col-lg-3.profile-settings-sidebar#new-navigation
+    %h4.prepend-top-0
+      New Navigation
+    %p
+      This setting allows you to turn on or off the new upcoming navigation concept.
+      = succeed '.' do
+        = link_to 'Learn more', '', target: '_blank'
+  .col-lg-9.syntax-theme
+    = label_tag do
+      .preview= image_tag "old_nav.png"
+      %input.js-expirement-feature-toggle{ type: "radio", value: "false", name: "new_nav", checked: !show_new_nav? }
+      Old
+    = label_tag do
+      .preview= image_tag "new_nav.png"
+      %input.js-expirement-feature-toggle{ type: "radio", value: "true", name: "new_nav", checked: show_new_nav? }
+      New
+  .col-sm-12
+    %hr
   .col-lg-3.profile-settings-sidebar
     %h4.prepend-top-0
       Behavior