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diff --git a/Source/WebCore/rendering/LayerFragment.h b/Source/WebCore/rendering/LayerFragment.h
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+++ b/Source/WebCore/rendering/LayerFragment.h
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+/*
+ * Copyright (C) 2015 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 "ClipRect.h"
+
+namespace WebCore {
+
+class LayerFragment {
+public:
+    LayerFragment() = default;
+    
+    void setRects(const LayoutRect& bounds, const ClipRect& background, const ClipRect& foreground, const LayoutRect* bbox)
+    {
+        layerBounds = bounds;
+        backgroundRect = background;
+        foregroundRect = foreground;
+        if (bbox) {
+            boundingBox = *bbox;
+            hasBoundingBox = true;
+        }
+    }
+    
+    void moveBy(const LayoutPoint& offset)
+    {
+        layerBounds.moveBy(offset);
+        backgroundRect.moveBy(offset);
+        foregroundRect.moveBy(offset);
+        paginationClip.moveBy(offset);
+        boundingBox.moveBy(offset);
+    }
+    
+    void intersect(const LayoutRect& rect)
+    {
+        backgroundRect.intersect(rect);
+        foregroundRect.intersect(rect);
+        boundingBox.intersect(rect);
+    }
+    
+    void intersect(const ClipRect& clipRect)
+    {
+        backgroundRect.intersect(clipRect);
+        foregroundRect.intersect(clipRect);
+    }
+
+    bool shouldPaintContent = false;
+    bool hasBoundingBox = false;
+    LayoutRect layerBounds;
+    ClipRect backgroundRect;
+    ClipRect foregroundRect;
+    LayoutRect boundingBox;
+    
+    // Unique to paginated fragments. The physical translation to apply to shift the layer when painting/hit-testing.
+    LayoutSize paginationOffset;
+    
+    // Also unique to paginated fragments. An additional clip that applies to the layer. It is in layer-local
+    // (physical) coordinates.
+    LayoutRect paginationClip;
+};
+
+typedef Vector<LayerFragment, 1> LayerFragments;
+
+} // namespace WebCore