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diff --git a/Source/WebKit/chromium/src/FindInPageCoordinates.h b/Source/WebKit/chromium/src/FindInPageCoordinates.h
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+/*
+ * Copyright (C) 2012 Google Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef FindInPageCoordinates_h
+#define FindInPageCoordinates_h
+
+#include "FloatRect.h"
+
+namespace WebCore {
+class Range;
+class RenderObject;
+}
+
+namespace WebKit {
+
+// Find-in-page coordinate conversion methods.
+//
+// This coordinate system is designed to give consistent tickmarks in cases where find matches
+// are in scrollable areas but might not be visible (e.g. child frames, scroll:overflow).
+// In these cases, using absolute positions might lead to tickmarks pointing outside the visible
+// area of its container, which is counter-intuitive for users.
+//
+// Find-in-page coordinates are represented as normalized fractions of the main frame document with
+// the property that they are built by composing the relative position of each renderer to the maximum
+// effective layout size of its container all the way up the render tree. The resulting coordinates
+// are scroll-independent, representing any contents scaled to the visible area of their container.
+// The provided methods support scroll:overflow and are CSS position and transform-friendly.
+
+WebCore::FloatRect findInPageRectFromAbsoluteRect(const WebCore::FloatRect&, const WebCore::RenderObject*);
+WebCore::FloatRect findInPageRectFromRange(WebCore::Range*);
+
+} // namespace WebKit
+
+#endif