Add new permission string for extensions that override new tab pages.

chrome/common/extensions/permissions/chrome_permission_message_rules.cc

 // Copyright 2014 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/extensions/permissions/chrome_permission_message_rules.h"
 
 #include "base/macros.h"
 #include "base/stl_util.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 360 matching lines @@
                              IDS_EXTENSION_PROMPT_WARNING_HOSTS_LIST),
        {APIPermission::kHostReadWrite},
        {}},
       {new HostListFormatter(IDS_EXTENSION_PROMPT_WARNING_1_HOST_READ_ONLY,
                              IDS_EXTENSION_PROMPT_WARNING_2_HOSTS_READ_ONLY,
                              IDS_EXTENSION_PROMPT_WARNING_3_HOSTS_READ_ONLY,
                              IDS_EXTENSION_PROMPT_WARNING_HOSTS_LIST_READ_ONLY),
        {APIPermission::kHostReadOnly},
        {}},
 
+      // New tab page permission is fairly highly used so rank it quite highly.
+      // Nothing should subsume it.
+      {IDS_EXTENSION_PROMPT_WARNING_NEW_TAB_PAGE_OVERRIDE,
+       {APIPermission::kNewTabPageOverride},
+       {}},
+
       // History-related permission messages.
       // History already allows reading favicons, tab access and accessing the
       // list of most frequently visited sites.
       {IDS_EXTENSION_PROMPT_WARNING_HISTORY_WRITE_AND_SESSIONS,
        {APIPermission::kHistory, APIPermission::kSessions},
        {APIPermission::kFavicon, APIPermission::kProcesses, APIPermission::kTab,
         APIPermission::kTopSites, APIPermission::kWebNavigation}},
       {IDS_EXTENSION_PROMPT_WARNING_HISTORY_READ_AND_SESSIONS,
        {APIPermission::kTab, APIPermission::kSessions},
        {APIPermission::kFavicon, APIPermission::kProcesses,
@@ skipping 248 matching lines @@
       {IDS_EXTENSION_PROMPT_WARNING_DISPLAY_SOURCE,
        {APIPermission::kDisplaySource},
        {}},
   };
 
   return std::vector<ChromePermissionMessageRule>(
       rules_arr, rules_arr + arraysize(rules_arr));
 }
 
 }  // namespace extensions