Add experiment for having a "Beta forum" link in the help menu.

chrome/browser/ui/browser_command_controller.cc

Index: chrome/browser/ui/browser_command_controller.cc
diff --git a/chrome/browser/ui/browser_command_controller.cc b/chrome/browser/ui/browser_command_controller.cc
index e917e1714c823428dc008522b8c9da25e9a191f0..362100fdd5009f9cbe7666a5892eb81399cd0458 100644
--- a/chrome/browser/ui/browser_command_controller.cc
+++ b/chrome/browser/ui/browser_command_controller.cc
@@ -621,6 +621,9 @@ void BrowserCommandController::ExecuteCommandWithDisposition(
     case IDC_HELP_PAGE_VIA_MENU:
       ShowHelp(browser_, HELP_SOURCE_MENU);
       break;
+    case IDC_SHOW_BETA_FORUM:
+      ShowBetaForum(browser_);
+      break;
     case IDC_SHOW_SIGNIN:
       ShowBrowserSigninOrSettings(
           browser_, signin_metrics::AccessPoint::ACCESS_POINT_MENU);
@@ -794,6 +797,7 @@ void BrowserCommandController::InitCommandState() {
   command_updater_.UpdateCommandEnabled(IDC_HELP_MENU, true);
   command_updater_.UpdateCommandEnabled(IDC_HELP_PAGE_VIA_KEYBOARD, true);
   command_updater_.UpdateCommandEnabled(IDC_HELP_PAGE_VIA_MENU, true);
+  command_updater_.UpdateCommandEnabled(IDC_SHOW_BETA_FORUM, true);
   command_updater_.UpdateCommandEnabled(IDC_BOOKMARKS_MENU, !guest_session);
   command_updater_.UpdateCommandEnabled(IDC_RECENT_TABS_MENU,
                                         !guest_session &&