Overlay scrollbars flush with window edge

chrome/browser/ui/libgtkui/native_theme_gtk3.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_UI_LIBGTKUI_NATIVE_THEME_GTK3_H_
 #define CHROME_BROWSER_UI_LIBGTKUI_NATIVE_THEME_GTK3_H_
 
 #include "base/macros.h"
 #include "base/optional.h"
 #include "ui/native_theme/native_theme_base.h"
@@ skipping 17 matching lines @@
   void PaintScrollbarTrack(cc::PaintCanvas* canvas,
                            Part part,
                            State state,
                            const ScrollbarTrackExtraParams& extra_params,
                            const gfx::Rect& rect) const override;
   void PaintScrollbarThumb(
       cc::PaintCanvas* canvas,
       Part part,
       State state,
       const gfx::Rect& rect,
-      NativeTheme::ScrollbarOverlayColorTheme theme) const override;
+      const NativeTheme::ScrollbarThumbExtraParams& params) const override;
   void PaintScrollbarCorner(cc::PaintCanvas* canvas,
                             State state,
                             const gfx::Rect& rect) const override;
   void PaintMenuPopupBackground(
       cc::PaintCanvas* canvas,
       const gfx::Size& size,
       const MenuBackgroundExtraParams& menu_background) const override;
   void PaintMenuSeparator(
       cc::PaintCanvas* canvas,
       State state,
@@ skipping 15 matching lines @@
   ~NativeThemeGtk3() override;
 
   mutable base::Optional<SkColor> color_cache_[kColorId_NumColors];
 
   DISALLOW_COPY_AND_ASSIGN(NativeThemeGtk3);
 };
 
 }  // namespace libgtkui
 
 #endif  // CHROME_BROWSER_UI_LIBGTKUI_NATIVE_THEME_GTK3_H_