Implements a display scale tray setting behind a chrome switch

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 3103 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.";
 
+#if defined(OS_CHROMEOS) && defined(USE_ASH)
+// Name of the flag that enables display scale tray settings.
+const char kAshEnableScaleSettingsTrayName[] = "Display scale tray setting";
+
+// Description of the flag that enables display scale tray settings.
+const char kAshEnableScaleSettingsTrayDescription[] =
+    "Enables a setting in the system tray to change the device scale factor of "
+    "the device to any fractional value.";
+#endif  // defined(OS_CHROMEOS) && defined(USE_ASH)
+
 }  // namespace flag_descriptions