Add an about:flag to enable client-side LoFi

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 1195 matching lines @@
     "Data Saver Site Breakdown";
 
 const char kEnableDataReductionProxySiteBreakdownDescription[] =
     "Enable the site breakdown on the Data Saver settings page.";
 
 const char kEnableOfflinePreviewsName[] = "Offline Page Previews";
 
 const char kEnableOfflinePreviewsDescription[] =
     "Enable showing offline page previews on slow networks.";
 
+const char kEnableClientLoFiName[] = "Client-side Lo-Fi previews";
+
+const char kEnableClientLoFiDescription[] =
+    "Enable showing low fidelity images on some pages on slow networks.";
+
 #endif  // defined(OS_ANDROID)
 
 const char kLcdTextName[] = "LCD text antialiasing";
 
 const char kLcdTextDescription[] =
     "If disabled, text is rendered with grayscale antialiasing instead of "
     "LCD (subpixel) when doing accelerated compositing.";
 
 const char kDistanceFieldTextName[] = "Distance field text";
 
@@ skipping 1905 matching lines @@
     "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