Add support for multi resolution icons

ui/gfx/image_unittest_util.h

Index: ui/gfx/image_unittest_util.h
diff --git a/ui/gfx/image_unittest_util.h b/ui/gfx/image_unittest_util.h
new file mode 100644
index 0000000000000000000000000000000000000000..f087f90cb0aa8e24a493142cbd2022d5cf898494
--- /dev/null
+++ b/ui/gfx/image_unittest_util.h
@@ -0,0 +1,33 @@
+// 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.
+
+// Because the unit tests for gfx::Image are spread across multiple
+// implementation files, this header contains the reusable components.
+
+#ifndef UI_GFX_IMAGE_UNITTEST_UTIL_H_
+#define UI_GFX_IMAGE_UNITTEST_UTIL_H_
+
+#include "ui/gfx/image.h"
+
+namespace gfx {
+namespace test {
+
+#if defined(OS_MACOSX)
+typedef NSImage* PlatformImage;
+#elif defined(OS_LINUX) && !defined(TOOLKIT_VIEWS)
+typedef GdkPixbuf* PlatformImage;
+#else
+typedef const SkBitmap* PlatformImage;
+#endif
+
+SkBitmap* CreateBitmap(int width, int height);
+
+PlatformImage CreatePlatformImage();
+
+gfx::Image::RepresentationType GetPlatformRepresentationType();
+
+}  // namespace test
+}  // namespace gfx
+
+#endif  // UI_GFX_IMAGE_UNITTEST_UTIL_H_