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

chrome/browser/ui/chrome_pages.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/chrome_pages.h"
 
 #include <stddef.h>
 
 #include "base/command_line.h"
 #include "base/feature_list.h"
@@ skipping 234 matching lines @@
 }
 
 void ShowHelp(Browser* browser, HelpSource source) {
   ShowHelpImpl(browser, browser->profile(), source);
 }
 
 void ShowHelpForProfile(Profile* profile, HelpSource source) {
   ShowHelpImpl(NULL, profile, source);
 }
 
+void ShowBetaForum(Browser* browser) {
+  ShowSingletonTab(browser, GURL(kChromeBetaForumURL));
+}
+
 void ShowPolicy(Browser* browser) {
   ShowSingletonTab(browser, GURL(kChromeUIPolicyURL));
 }
 
 void ShowSlow(Browser* browser) {
 #if defined(OS_CHROMEOS)
   ShowSingletonTab(browser, GURL(kChromeUISlowURL));
 #endif
 }
 
@@ skipping 185 matching lines @@
       SigninManagerFactory::GetForProfile(original_profile);
   DCHECK(manager->IsSigninAllowed());
   if (manager->IsAuthenticated())
     ShowSettings(browser);
   else
     ShowBrowserSignin(browser, access_point);
 }
 #endif
 
 }  // namespace chrome