ThumbnailTabHelper: Capture thumbnail when page load finishes

chrome/browser/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 "chrome/browser/flag_descriptions.h"
 
 namespace flag_descriptions {
 
 //  Material Design version of chrome://bookmarks
 
@@ skipping 3109 matching lines @@
     "Request server-side suggestions even if there are only very few of them "
     "and use them for tiles on the New Tab Page.";
 
 const char kLocationHardReloadName[] =
     "Experimental change for Location.reload() to trigger a hard-reload.";
 
 const char kLocationHardReloadDescription[] =
     "Enable an experimental change for Location.reload() to trigger a "
     "hard-reload.";
 
+const char kCaptureThumbnailOnLoadFinishedName[] =
+    "Capture page thumbnail on load finished";
+
+const char kCaptureThumbnailOnLoadFinishedDescription[] =
+    "Capture a page thumbnail (for use on the New Tab page) when the page load "
+    "finishes, in addition to other times a thumbnail may be captured.";
+
 }  // namespace flag_descriptions