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diff --git a/Source/WebCore/page/scrolling/ScrollSnapOffsetsInfo.h b/Source/WebCore/page/scrolling/ScrollSnapOffsetsInfo.h
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+++ b/Source/WebCore/page/scrolling/ScrollSnapOffsetsInfo.h
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+/*
+ * Copyright (C) 2016 Apple 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:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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.
+ */
+
+#pragma once
+
+#include <wtf/Vector.h>
+
+namespace WebCore {
+
+template <typename T>
+struct ScrollOffsetRange {
+    T start;
+    T end;
+};
+
+template <typename T>
+struct ScrollSnapOffsetsInfo {
+    Vector<T> horizontalSnapOffsets;
+    Vector<T> verticalSnapOffsets;
+
+    // Snap offset ranges represent non-empty ranges of scroll offsets in which scrolling may rest after scroll snapping.
+    // These are used in two cases: (1) for proximity scroll snapping, where portions of areas between adjacent snap offsets
+    // may emit snap offset ranges, and (2) in the case where the snap area is larger than the snap port, in which case areas
+    // where the snap port fits within the snap area are considered to be valid snap positions.
+    Vector<ScrollOffsetRange<T>> horizontalSnapOffsetRanges;
+    Vector<ScrollOffsetRange<T>> verticalSnapOffsetRanges;
+};
+
+}; // namespace WebCore