Gtk3: Render a GtkHeaderBar as the background of the tab strip

chrome/browser/ui/libgtkui/gtk_ui.cc

 // 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.
 
 #include "chrome/browser/ui/libgtkui/gtk_ui.h"
 
 #include <math.h>
 #include <pango/pango.h>
 #include <X11/Xcursor/Xcursor.h>
 
@@ skipping 913 matching lines @@
 
   temp_color = color_utils::HSLShift(frame_color, kDefaultTintFrameIncognito);
   GetChromeStyleColor("incognito-frame-color", &temp_color);
   colors_[ThemeProperties::COLOR_FRAME_INCOGNITO] = temp_color;
 
   temp_color =
       color_utils::HSLShift(frame_color, kDefaultTintFrameIncognitoInactive);
   GetChromeStyleColor("incognito-inactive-frame-color", &temp_color);
   colors_[ThemeProperties::COLOR_FRAME_INCOGNITO_INACTIVE] = temp_color;
 #else
-  // TODO(thomasanderson): Render a GtkHeaderBar directly.
   SkColor color_frame = GetBgColor("#headerbar.header-bar.titlebar");
   SkColor color_frame_inactive =
       GetBgColor("#headerbar.header-bar.titlebar:backdrop");
   colors_[ThemeProperties::COLOR_FRAME] = color_frame;
   colors_[ThemeProperties::COLOR_FRAME_INACTIVE] = color_frame_inactive;
   colors_[ThemeProperties::COLOR_FRAME_INCOGNITO] =
       color_utils::HSLShift(color_frame, kDefaultTintFrameIncognito);
   colors_[ThemeProperties::COLOR_FRAME_INCOGNITO_INACTIVE] =
       color_utils::HSLShift(color_frame_inactive, kDefaultTintFrameIncognito);
 #endif
@@ skipping 108 matching lines @@
 
 float GtkUi::GetDeviceScaleFactor() const {
   return device_scale_factor_;
 }
 
 }  // namespace libgtkui
 
 views::LinuxUI* BuildGtkUi() {
   return new libgtkui::GtkUi;
 }