NTP4/Sync Promo:

chrome/browser/ui/webui/ntp/ntp_login_handler.h

 // Copyright (c) 2011 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.
 
 #ifndef CHROME_BROWSER_UI_WEBUI_NTP_NTP_LOGIN_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_NTP_NTP_LOGIN_HANDLER_H_
 #pragma once
 
 #include "chrome/browser/prefs/pref_member.h"
 #include "content/browser/webui/web_ui.h"
@@ skipping 20 matching lines @@
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
   // Returns true if the login handler should be shown in a new tab page
   // for the given |profile|. |profile| must not be NULL.
   static bool ShouldShow(Profile* profile);
 
  private:
   // User actions while on the NTP when clicking on or viewing the sync promo.
-  enum SyncPromoNTPPromoBuckets {
-    SYNC_PROMO_NTP_PROMO_VIEWED,
-    SYNC_PROMO_NTP_PROMO_CLICKED,
-    SYNC_PROMO_NTP_PROMO_BUCKET_BOUNDARY,
+  enum NTPSignInPromoBuckets {
+    NTP_SIGN_IN_PROMO_VIEWED,
+    NTP_SIGN_IN_PROMO_CLICKED,
+    NTP_SIGN_IN_PROMO_BUCKET_BOUNDARY,
   };
 
   // Called from JS when the NTP is loaded. |args| is the list of arguments
   // passed from JS and should be an empty list.
   void HandleInitializeSyncLogin(const ListValue* args);
 
   // Called from JS when the user clicks the login container. It shows the
   // appropriate UI based on the current sync state. |args| is the list of
   // arguments passed from JS and should be an empty list.
   void HandleShowSyncLoginUI(const ListValue* args);
 
+  // Records actions in SyncPromo.NTPPromo histogram.
+  void RecordInHistogram(int type);
+
   // Internal helper method
   void UpdateLogin();
 
   StringPrefMember username_pref_;
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_NTP_NTP_LOGIN_HANDLER_H_