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

chrome/browser/ui/libgtkui/gtk_util.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_util.h"
 
 #include <dlfcn.h>
 #include <gdk/gdk.h>
 #include <gdk/gdkx.h>
 #include <gtk/gtk.h>
@@ skipping 47 matching lines @@
   static void* gtk3lib = dlopen("libgtk-3.so.0", RTLD_LAZY);
   DCHECK(gtk3lib);
   return gtk3lib;
 }
 #endif
 
 }  // namespace
 
 namespace libgtkui {
 
+// TODO(erg): ThemeService has a whole interface just for reading default
+// constants. Figure out what to do with that more long term; for now, just
+// copy the constants themselves here.
+const color_utils::HSL kDefaultTintFrameIncognito = {-1, 0.2f, 0.35f};
+const color_utils::HSL kDefaultTintFrameIncognitoInactive = {-1, 0.3f, 0.6f};
+
 // Theme colors returned by GetSystemColor().
 const SkColor kInvalidColorIdColor = SkColorSetRGB(255, 0, 128);
 const SkColor kURLTextColor = SkColorSetRGB(0x0b, 0x80, 0x43);
 
 SkColor NormalURLColor(SkColor foreground) {
   color_utils::HSL fg_hsl, hue_hsl;
   color_utils::SkColorToHSL(foreground, &fg_hsl);
   color_utils::SkColorToHSL(kURLTextColor, &hue_hsl);
 
   // Only allow colors that have a fair amount of saturation in them (color vs
@@ skipping 360 matching lines @@
 
   AddBorders(context);
   PixelSurface surface;
   RenderBackground(surface.cairo(), context);
   gtk_render_frame(context, surface.cairo(), 0, 0, 1, 1);
   return surface.GetPixelValue();
 }
 #endif
 
 }  // namespace libgtkui