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>
 
 #include "ui/native_theme/native_theme.h"
 
 namespace aura {
 class Window;
 }
 
 namespace base {
 class CommandLine;
 class Environment;
 }
 
+namespace color_utils {
+struct HSL;
+}
+
 namespace ui {
 class Accelerator;
 }
 
 namespace libgtkui {
 
+// Default frame tints
+extern const color_utils::HSL kDefaultTintFrameIncognito;
+extern const color_utils::HSL kDefaultTintFrameIncognitoInactive;
+
 extern const SkColor kInvalidColorIdColor;
 extern const SkColor kURLTextColor;
 
 // Generates the normal URL color, a green color used in unhighlighted URL
 // text. It is a mix of |kURLTextColor| and the current text color.  Unlike the
 // selected text color, it is more important to match the qualities of the
 // foreground typeface color instead of taking the background into account.
 SkColor NormalURLColor(SkColor foreground);
 
 // Generates the selected URL color, a green color used on URL text in the
@@ skipping 75 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 the backgrounds of all ancestors of |context|, then renders
+// the background for |context| itself.
+void RenderBackground(const gfx::Size& size,
+                      cairo_t* cr,
+                      GtkStyleContext* context);
+
 // 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_