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diff --git a/chromium/third_party/WebKit/Source/core/rendering/compositing/GraphicsLayerUpdater.h b/chromium/third_party/WebKit/Source/core/rendering/compositing/GraphicsLayerUpdater.h
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+++ b/chromium/third_party/WebKit/Source/core/rendering/compositing/GraphicsLayerUpdater.h
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+/*
+ * Copyright (C) 2009, 2010 Apple Inc. All rights reserved.
+ * Copyright (C) 2014 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:
+ * 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. ``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 COMPUTER, INC. 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 GraphicsLayerUpdater_h
+#define GraphicsLayerUpdater_h
+
+#include "platform/graphics/GraphicsLayer.h"
+
+namespace WebCore {
+
+class RenderLayer;
+
+class GraphicsLayerUpdater {
+    class UpdateContext {
+    public:
+        UpdateContext()
+            : m_compositingStackingContext(0)
+            , m_compositingAncestor(0)
+        {
+        }
+
+        UpdateContext(const UpdateContext&, const RenderLayer&);
+
+        const RenderLayer* compositingContainer(const RenderLayer&) const;
+    private:
+        const RenderLayer* m_compositingStackingContext;
+        const RenderLayer* m_compositingAncestor;
+    };
+
+public:
+    GraphicsLayerUpdater();
+    ~GraphicsLayerUpdater();
+
+    enum UpdateType {
+        DoNotForceUpdate,
+        ForceUpdate,
+    };
+
+    void update(Vector<RenderLayer*>& layersNeedingPaintInvalidation, RenderLayer&, UpdateType = DoNotForceUpdate, const UpdateContext& = UpdateContext());
+    void rebuildTree(RenderLayer&, GraphicsLayerVector& childLayersOfEnclosingLayer);
+
+    bool needsRebuildTree() const { return m_needsRebuildTree; }
+
+#if ASSERT_ENABLED
+    static void assertNeedsToUpdateGraphicsLayerBitsCleared(RenderLayer&);
+#endif
+
+private:
+    bool m_needsRebuildTree;
+};
+
+} // namespace WebCore
+
+#endif // GraphicsLayerUpdater_h