Monitor the system native frame color on Win 10.

chrome/browser/themes/theme_service.h

 // Copyright (c) 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.
 
 #ifndef CHROME_BROWSER_THEMES_THEME_SERVICE_H_
 #define CHROME_BROWSER_THEMES_THEME_SERVICE_H_
 
 #include <map>
 #include <set>
 #include <string>
 #include <utility>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/threading/non_thread_safe.h"
 #include "build/build_config.h"
 #include "components/keyed_service/core/keyed_service.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "ui/base/theme_provider.h"
 
+#if defined(OS_WIN)
+#include "base/win/registry.h"
+#endif
+
 class CustomThemeSupplier;
 class BrowserThemePack;
 class ThemeSyncableService;
 class Profile;
 
 namespace base {
 class FilePath;
 }
 
 namespace color_utils {
@@ skipping 217 matching lines @@
 
 #if defined(ENABLE_SUPERVISED_USERS)
   // Returns true if the profile belongs to a supervised user.
   bool IsSupervisedUser() const;
 
   // Sets the current theme to the supervised user theme. Should only be used
   // for supervised user profiles.
   void SetSupervisedUserTheme();
 #endif
 
+#if defined(OS_WIN)
+  // Returns true if the window frame color is determined by the DWM, i.e. this
+  // is a native frame on Win 10+.
+  bool ShouldUseDwmFrameColor() const;
+
+  // Callback executed when |dwm_key_| is updated.  This re-reads the active
+  // frame color and updates |dwm_frame_color_|.
+  void OnDwmKeyUpdated();
+#endif
+
 #if defined(OS_MACOSX)
   // |nsimage_cache_| retains the images it has cached.
   typedef std::map<int, NSImage*> NSImageMap;
   mutable NSImageMap nsimage_cache_;
 
   // |nscolor_cache_| retains the colors it has cached.
   typedef std::map<int, NSColor*> NSColorMap;
   mutable NSColorMap nscolor_cache_;
 
   typedef std::map<int, NSGradient*> NSGradientMap;
   mutable NSGradientMap nsgradient_cache_;
 #endif
 
   ui::ResourceBundle& rb_;
   Profile* profile_;
 
   scoped_refptr<CustomThemeSupplier> theme_supplier_;
 
   // The id of the theme extension which has just been installed but has not
   // been loaded yet. The theme extension with |installed_pending_load_id_| may
   // never be loaded if the install is due to updating a disabled theme.
   // |pending_install_id_| should be set to |kDefaultThemeID| if there are no
   // recently installed theme extensions
   std::string installed_pending_load_id_;
 
   // The number of infobars currently displayed.
   int number_of_infobars_;
 
+#if defined(OS_WIN)
+  // Registry key containing the params that determine the DWM frame color.
+  // This is only initialized on Windows 10.
+  scoped_ptr<base::win::RegKey> dwm_key_;
+
+  // The DWM frame color, if available; white otherwise.
+  SkColor dwm_frame_color_;
+#endif
+
   content::NotificationRegistrar registrar_;
 
   scoped_ptr<ThemeSyncableService> theme_syncable_service_;
 
 #if defined(ENABLE_EXTENSIONS)
   class ThemeObserver;
   scoped_ptr<ThemeObserver> theme_observer_;
 #endif
 
   BrowserThemeProvider original_theme_provider_;
   BrowserThemeProvider incognito_theme_provider_;
 
   base::WeakPtrFactory<ThemeService> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ThemeService);
 };
 
 #endif  // CHROME_BROWSER_THEMES_THEME_SERVICE_H_