Fix the misalignment on CrOS of the tab background images

chrome/browser/ui/views/tabs/tab_paint_util.h

+// Copyright (c) 2013 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_VIEWS_TABS_TAB_PAINT_UTIL_H_
+#define CHROME_BROWSER_UI_VIEWS_TABS_TAB_PAINT_UTIL_H_
+
+#include "base/basictypes.h"
+
+namespace gfx {
+class ImageSkia;
+}
+namespace ui {
+class ThemeProvider;
+}
+
+// Utility class for tab related code.
+class TabPaintUtil {
+ public:
+  // Tiles |background_id| and |background_overlay_id| onto an image of size
+  // |dst_w|x|dst_h|. |relative_y_offset| is the relative y position of
+  // |background_id| relative to |background_overlay_id|.
+  // |src_x|, |src_y|, and |relative_y_offset| should be set so that
+  // |background_id| lines up with the frame image and that
+  // |background_overlay_id| lines up with the top of the tab.
+  static gfx::ImageSkia CreateTiledInactiveBackground(
+      ui::ThemeProvider* theme_provider,
+      int background_id,
+      int background_overlay_id,
+      int relative_y_offset,
+      int src_x,
+      int src_y,
+      int dst_w,
+      int dst_h);
+
+ private:
+  DISALLOW_IMPLICIT_CONSTRUCTORS(TabPaintUtil);
+};
+
+#endif  // CHROME_BROWSER_UI_VIEWS_TABS_TAB_PAINT_UTIL_H_