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

chrome/browser/ui/libgtk2ui/skia_utils_gtk2.h

Index: chrome/browser/ui/libgtk2ui/skia_utils_gtk2.h
diff --git a/chrome/browser/ui/libgtk2ui/skia_utils_gtk2.h b/chrome/browser/ui/libgtk2ui/skia_utils_gtk2.h
new file mode 100644
index 0000000000000000000000000000000000000000..117d700d7371e29573e862b7205d22216b2da08f
--- /dev/null
+++ b/chrome/browser/ui/libgtk2ui/skia_utils_gtk2.h
@@ -0,0 +1,23 @@
+// 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_