Aura/GTK integration: Create a small stub library that can talk to GTK.

chrome/browser/ui/libgtk2ui/skia_utils_gtk2.h

+// Copyright (c) 2011 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_LIBGTK2UI_SKIA_UTILS_GTK2_H_
+#define CHROME_BROWSER_UI_LIBGTK2UI_SKIA_UTILS_GTK2_H_
+#pragma once
+
+#include "third_party/skia/include/core/SkColor.h"
+
+typedef struct _GdkColor GdkColor;
+
+namespace libgtk2ui {
+
+// Converts GdkColors to the ARGB layout Skia expects.
+SkColor GdkColorToSkColor(GdkColor color);
+
+// Converts ARGB to GdkColor.
+GdkColor SkColorToGdkColor(SkColor color);
+
+}  // namespace libgtk2ui
+
+#endif  // CHROME_BROWSER_UI_LIBGTK2UI_SKIA_UTILS_GTK2_H_