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

chrome/browser/ui/chrome_pages.cc

Index: chrome/browser/ui/chrome_pages.cc
diff --git a/chrome/browser/ui/chrome_pages.cc b/chrome/browser/ui/chrome_pages.cc
index fb25d5ce4ba2139607d246a60ac5f11429daec62..78cf00f9e4c5215abd889d030db9d3ebe707217f 100644
--- a/chrome/browser/ui/chrome_pages.cc
+++ b/chrome/browser/ui/chrome_pages.cc
@@ -252,6 +252,10 @@ 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));
 }