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

chrome/common/url_constants.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/common/url_constants.h"
 
 #include <algorithm>
 
 #include "base/macros.h"
 #include "build/build_config.h"
@@ skipping 433 matching lines @@
 #if defined(OS_CHROMEOS)
 #if defined(GOOGLE_CHROME_BUILD)
     "chrome-extension://honijodknafkokifofgiaalefdiedpko/main.html";
 #else
     "https://support.google.com/chromebook/?p=help&ctx=settings";
 #endif  // defined(GOOGLE_CHROME_BUILD
 #else
     "https://support.google.com/chrome/?p=help&ctx=settings";
 #endif  // defined(OS_CHROMEOS)
 
+const char kChromeBetaForumURL[] =
+    "https://support.google.com/chrome/?p=beta_forum";
+
 #if defined(OS_CHROMEOS)
 const char kChromeAccessibilityHelpURL[] =
     "https://support.google.com/chromebook/topic/6323347";
 const char kChromeAccessibilitySettingsURL[] =
     "/chromevox/background/options.html";
 const char kChromePaletteHelpURL[] =
     "https://support.google.com/chromebook?p=stylus_help";
 #endif  // defined(OS_CHROMEOS)
 
 #if BUILDFLAG(ENABLE_ONE_CLICK_SIGNIN)
@@ skipping 365 matching lines @@
 #endif
 
 const char kChooserUsbOverviewURL[] =
     "https://support.google.com/chrome?p=webusb";
 
 #if defined(OS_CHROMEOS)
 const char kEolNotificationURL[] = "https://www.google.com/chromebook/older/";
 #endif
 
 }  // namespace chrome