Ensure UI elements contrast with the right frame color.

chrome/browser/themes/theme_service_win.h

 // Copyright 2016 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.
 
 #ifndef CHROME_BROWSER_THEMES_THEME_SERVICE_WIN_H_
 #define CHROME_BROWSER_THEMES_THEME_SERVICE_WIN_H_
 
 #include "base/win/registry.h"
 #include "chrome/browser/themes/theme_service.h"
 
@@ skipping 22 matching lines @@
   // Registry key containing the params that determine the DWM frame color.
   std::unique_ptr<base::win::RegKey> dwm_key_;
 
   // True if the frame should be colored using the DWM values here. False if the
   // default frame colors should be used instead.
   bool use_dwm_frame_color_;
 
   // The frame color when active.
   SkColor dwm_frame_color_;
 
+  // True if we took dwm_inactive_frame_color_ from the registry (vs calculating
+  // it ourselves) and thus Windows will use it too.
+  bool inactive_frame_color_from_registry_;
+
   // The frame color when inactive.
   SkColor dwm_inactive_frame_color_;
 
   // The DWM accent border color, if available; white otherwise.
   SkColor dwm_accent_border_color_;
 
   DISALLOW_COPY_AND_ASSIGN(ThemeServiceWin);
 };
 
 #endif  // CHROME_BROWSER_THEMES_THEME_SERVICE_WIN_H_