Display: set color_depth and depth_per_component value based on kEnableHDROutput

ui/display/display_switches.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 "build/build_config.h"
 #include "ui/display/display_switches.h"
 
 namespace switches {
 
 // TODO(rjkroege): Some of these have an "ash" prefix. When ChromeOS startup
@@ skipping 20 matching lines @@
 const char kSecondaryDisplayLayout[] = "secondary-display-layout";
 
 // Specifies the initial screen configuration, or state of all displays, for
 // FakeDisplayDelegate, see class for format details.
 const char kScreenConfig[] = "screen-config";
 
 // Uses the 1st display in --ash-host-window-bounds as internal display.
 // This is for debugging on linux desktop.
 const char kUseFirstDisplayAsInternal[] = "use-first-display-as-internal";
 
+// Use an fp16 scRGB swap chain compatible with HDR output.
+const char kEnableHDR[] = "enable-hdr";
+
 #if defined(OS_CHROMEOS)
 const char kDisableDisplayColorCalibration[] =
     "disable-display-color-calibration";
 
 // Enables unified desktop mode.
 const char kEnableUnifiedDesktop[] = "ash-enable-unified-desktop";
 #endif
 
 }  // namespace switches