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

chrome/browser/ui/libgtkui/gtk_util.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_LIBGTKUI_GTK_UTIL_H_
 #define CHROME_BROWSER_UI_LIBGTKUI_GTK_UTIL_H_
 
 #include <gtk/gtk.h>
 #include <string>
 
@@ skipping 102 matching lines @@
 typedef ScopedGObject<GtkStyleContext> ScopedStyleContext;
 
 // Parses |css_selector| into a GtkStyleContext.  The format is a
 // sequence of whitespace-separated objects.  Each object may have at
 // most one object name at the beginning of the string, and any number
 // of '.'-prefixed classes and ':'-prefixed pseudoclasses.  An example
 // is "GtkButton.button.suggested-action:hover:active".  The caller
 // must g_object_unref() the returned context.
 ScopedStyleContext GetStyleContextFromCss(const char* css_selector);
 
+// Removes all border-type properties on |context| and all of its parents.
+void RemoveBorders(GtkStyleContext* context);
+
 // Get the 'color' property from the style context created by
 // GetStyleContextFromCss(|css_selector|).
 SkColor GetFgColor(const char* css_selector);
 
 // Renders a background from the style context created by
 // GetStyleContextFromCss(|css_selector|) into a single pixel and
 // returns the color.
 SkColor GetBgColor(const char* css_selector);
 
 // If there is a border, renders the border from the style context
 // created by GetStyleContextFromCss(|css_selector|) into a single
 // pixel and returns the color.  Otherwise returns kInvalidColor.
 SkColor GetBorderColor(const char* css_selector);
 #endif
 
 }  // namespace libgtkui
 
 #endif  // CHROME_BROWSER_UI_LIBGTKUI_GTK_UTIL_H_