[NTP4] Experiment for adding Chrome Web Store link to footer.

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

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// 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.
 
 #ifndef CHROME_BROWSER_UI_WEBUI_NTP_NEW_TAB_UI_H_
 #define CHROME_BROWSER_UI_WEBUI_NTP_NEW_TAB_UI_H_
 #pragma once
 
 #include <string>
 
 #include "base/gtest_prod_util.h"
@@ skipping 11 matching lines @@
 
 // The TabContents used for the New Tab page.
 class NewTabUI : public content::WebUIController,
                  public content::NotificationObserver {
  public:
   explicit NewTabUI(content::WebUI* web_ui);
   virtual ~NewTabUI();
 
   static void RegisterUserPrefs(PrefService* prefs);
 
+  // Sets up any experiment in which the NTP might want to participate.
+  // The CWS footer link is one such example.
+  static void SetupFieldTrials();
+
+  // Returns whether or not the CWS footer experiment is enabled.
+  static bool IsWebStoreExperimentEnabled();
+
   // Adds "url", "title", and "direction" keys on incoming dictionary, setting
   // title as the url as a fallback on empty title.
   static void SetURLTitleAndDirection(base::DictionaryValue* dictionary,
                                       const string16& title,
                                       const GURL& gurl);
 
   // Returns a pointer to a NewTabUI if the WebUIController object is a new tab
   // page.
   static NewTabUI* FromWebUIController(content::WebUIController* ui);
 
@@ skipping 54 matching lines @@
   base::TimeTicks last_paint_;
   // Scoping so we can be sure our timeouts don't outlive us.
   base::OneShotTimer<NewTabUI> timer_;
   // The preference version. This used for migrating prefs of the NTP.
   static const int current_pref_version_ = 3;
 
   DISALLOW_COPY_AND_ASSIGN(NewTabUI);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_NTP_NEW_TAB_UI_H_