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

chrome/browser/ui/libgtkui/gtk_util.cc

Index: chrome/browser/ui/libgtkui/gtk_util.cc
diff --git a/chrome/browser/ui/libgtkui/gtk_util.cc b/chrome/browser/ui/libgtkui/gtk_util.cc
index 633539dfac49f211e723146fe46f184fee9a759c..bc7b9f9341cc405449d72d0e343aaf333487949d 100644
--- a/chrome/browser/ui/libgtkui/gtk_util.cc
+++ b/chrome/browser/ui/libgtkui/gtk_util.cc
@@ -65,6 +65,12 @@ void* GetGtk3SharedLibrary() {
 
 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);