Overlay scrollbars flush with window edge

chrome/browser/ui/libgtkui/native_theme_gtk3.cc

 // 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.
 
 #include "chrome/browser/ui/libgtkui/native_theme_gtk3.h"
 
 #include <gtk/gtk.h>
 
 #include "chrome/browser/ui/libgtkui/chrome_gtk_frame.h"
 #include "chrome/browser/ui/libgtkui/chrome_gtk_menu_subclasses.h"
@@ skipping 462 matching lines @@
                                     ? "GtkScrollbar#scrollbar #contents #trough"
                                     : "GtkScrollbar.scrollbar.trough"),
               BG_RENDER_NORMAL, true);
 }
 
 void NativeThemeGtk3::PaintScrollbarThumb(
     cc::PaintCanvas* canvas,
     Part part,
     State state,
     const gfx::Rect& rect,
-    NativeTheme::ScrollbarOverlayColorTheme theme) const {
+    const NativeTheme::ScrollbarThumbExtraParams&) const {

[Evan Stade, 2017/03/28 00:01:56]

nit: we don't leave off the parameter name even when it's unused (here and
elsewhere)

   auto context = GetStyleContextFromCss(
       GtkVersionCheck(3, 20)
           ? "GtkScrollbar#scrollbar #contents #trough #slider"
           : "GtkScrollbar.scrollbar.slider");
   gtk_style_context_set_state(context, StateToStateFlags(state));
   PaintWidget(canvas, rect, context, BG_RENDER_NORMAL, true);
 }
 
 void NativeThemeGtk3::PaintScrollbarCorner(cc::PaintCanvas* canvas,
                                            State state,
@@ skipping 99 matching lines @@
 
   if (frame_top_area.incognito) {
     bitmap = SkBitmapOperations::CreateHSLShiftedBitmap(
         bitmap, kDefaultTintFrameIncognito);
   }
 
   canvas->drawBitmap(bitmap, rect.x(), rect.y());
 }
 
 }  // namespace libgtkui