Settings Overides -- warn user when extensions override their NTP.

chrome/browser/ui/browser_tabstrip.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/browser_tabstrip.h"
 
 #include "base/command_line.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_navigator.h"
 #include "chrome/browser/ui/tab_contents/core_tab_helper.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/url_constants.h"
 #include "content/public/browser/navigation_entry.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/web_contents.h"
 
+#if defined(TOOLKIT_VIEWS) && defined(OS_WIN)
+#include "chrome/browser/ui/views/settings_api_bubble_helper_views.h"
+#endif  // TOOLKIT_VIEWS && OS_WIN
+
 namespace chrome {
 
 void AddTabAt(Browser* browser, const GURL& url, int idx, bool foreground) {
   // Time new tab page creation time.  We keep track of the timing data in
   // WebContents, but we want to include the time it takes to create the
   // WebContents object too.
   base::TimeTicks new_tab_start_time = base::TimeTicks::Now();
   chrome::NavigateParams params(browser,
       url.is_empty() ? GURL(chrome::kChromeUINewTabURL) : url,
       content::PAGE_TRANSITION_TYPED);
   params.disposition = foreground ? NEW_FOREGROUND_TAB : NEW_BACKGROUND_TAB;
   params.tabstrip_index = idx;
   chrome::Navigate(&params);
   CoreTabHelper* core_tab_helper =
       CoreTabHelper::FromWebContents(params.target_contents);
   core_tab_helper->set_new_tab_start_time(new_tab_start_time);
+
+#if defined(TOOLKIT_VIEWS) && defined(OS_WIN)
+  if (url.is_empty())
+    extensions::MaybeShowExtensionControlledNewTabPage(browser);
+#endif
 }
 
 content::WebContents* AddSelectedTabWithURL(
     Browser* browser,
     const GURL& url,
     content::PageTransition transition) {
   NavigateParams params(browser, url, transition);
   params.disposition = NEW_FOREGROUND_TAB;
   Navigate(&params);
   return params.target_contents;
@@ skipping 32 matching lines @@
     return;
   }
 
   browser->tab_strip_model()->CloseWebContentsAt(
       index,
       add_to_history ? TabStripModel::CLOSE_CREATE_HISTORICAL_TAB
                      : TabStripModel::CLOSE_NONE);
 }
 
 }  // namespace chrome