Page zoom improvements

chrome/browser/chrome_page_zoom.h

+// Copyright (c) 2009 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_CHROME_PAGE_ZOOM_H_
+#define CHROME_BROWSER_CHROME_PAGE_ZOOM_H_
+#pragma once
+
+#include <vector>
+
+namespace chrome_page_zoom {
+
+// Return a sorted vector of zoom factors. The vector will consist of preset
+// values along with a custom value (if the custom value is not already
+// represented.)
+std::vector<double> PresetZoomFactors(double custom_factor);
+
+// Return a sorted vector of zoom levels. The vector will consist of preset
+// values along with a custom value (if the custom value is not already
+// represented.)
+std::vector<double> PresetZoomLevels(double custom_level);
+
+}  // namespace chrome_page_zoom
+
+#endif  // CHROME_BROWSER_CHROME_PAGE_ZOOM_H_