Implement favicon.ico variant selection.

chrome/browser/favicon/select_favicon_frames.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_FAVICON_SELECT_FAVICON_FRAMES_H_
+#define CHROME_BROWSER_FAVICON_SELECT_FAVICON_FRAMES_H_
+
+#include <vector>
+
+#include "ui/base/layout.h"
+
+class SkBitmap;
+
+namespace gfx {
+class ImageSkia;
+}
+
+// Takes a list of all bitmaps found in a .ico file, and creates an
+// ImageSkia that's desired_size x desired_size pixels big. This
+// function adds a representation at every desired scale factor.
+// If desired_size is 0, the largest bitmap is returned unmodified.
+gfx::ImageSkia SelectFaviconFrames(
+    const std::vector<SkBitmap>& bitmaps,
+    const std::vector<ui::ScaleFactor>& scale_factors,
+    int desired_size);
+
+#endif  // CHROME_BROWSER_FAVICON_SELECT_FAVICON_FRAMES_H_