Add new mark-non-secure-as options to chrome://flags on iOS

ios/chrome/browser/ios_chrome_flag_descriptions.cc

 // Copyright 2017 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 "ios/chrome/browser/ios_chrome_flag_descriptions.h"
 
 // This file declares strings used in chrome://flags. These messages are not
 // translated, because instead of end-users they target Chromium developers and
 // testers. See https://crbug.com/587272 and https://crbug.com/703134 for more
 // details.
 
 namespace flag_descriptions {
 
 const char kBrowserTaskScheduler[] = "Task Scheduler";
 
 const char kBrowserTaskSchedulerDescription[] =
     "Enables redirection of some task posting APIs to the task scheduler.";
 
 const char kContextualSearch[] = "Contextual Search";
 
 const char kContextualSearchDescription[] =
     "Whether or not Contextual Search is enabled.";
 
 const char kPhysicalWeb[] = "Physical Web";
 
 const char kPhysicalWebDescription[] =
     "When enabled, the omnibox will include suggestions for web pages "
     "broadcast by devices near you.";
 
+const char kMarkHttpAsName[] = "Mark non-secure origins as non-secure";
+
+const char kMarkHttpAsDescription[] = "Change the UI treatment for HTTP pages";
+const char kMarkHttpAsDangerous[] = "Always mark HTTP as actively dangerous";
+const char kMarkHttpAsNonSecureAfterEditing[] =
+    "Warn on HTTP after editing forms";
+const char kMarkHttpAsNonSecureWhileIncognito[] =
+    "Warn on HTTP while in Incognito mode";
+const char kMarkHttpAsNonSecureWhileIncognitoOrEditing[] =
+    "Warn on HTTP while in Incognito mode or after editing forms";
+
 }  // namespace flag_descriptions