color: Add color spin primaries for layout tests

ui/gfx/switches.cc

 // Copyright 2012 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/gfx/switches.h"
 
 namespace switches {
 
 #if defined(OS_WIN)
 // Disables DirectWrite font rendering for general UI elements.
 const char kDisableDirectWriteForUI[] = "disable-directwrite-for-ui";
 #endif
 
 #if defined(OS_MACOSX)
 // Enables the HarfBuzz port of RenderText on Mac (it's already used only for
 // text editing; this enables it for everything else).
 const char kEnableHarfBuzzRenderText[] = "enable-harfbuzz-rendertext";
 #endif
 
 // Run in headless mode, i.e., without a UI or display server dependencies.
 const char kHeadless[] = "headless";
 
 // Convert rasterization and compositing inputs to the output color space
 // before operating on them.
 const char kEnableColorCorrectRendering[] = "enable-color-correct-rendering";
 
 // Force all monitors to be treated as though they have the specified color
 // profile. Accepted values are "srgb" and "generic-rgb" (currently used by Mac
-// layout tests) and "bt2020-gamma18" (to be used by Mac layout tests in the
-// future).
+// layout tests) and "color-spin-gamma24" (used by layout tests).
 const char kForceColorProfile[] = "force-color-profile";
 
 }  // namespace switches