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diff --git a/Source/WebCore/platform/graphics/android/UpdateManager.h b/Source/WebCore/platform/graphics/android/UpdateManager.h
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+++ b/Source/WebCore/platform/graphics/android/UpdateManager.h
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+/*
+ * Copyright 2011, The Android Open Source Project
+ *
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``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 UpdateManager_h
+#define UpdateManager_h
+
+class SkCanvas;
+class SkRegion;
+
+namespace WebCore {
+
+class BaseTile;
+
+// UpdateManager Architecture
+
+// The UpdateManager is used to defer updates and invalidations to a layer,
+// so that the layer can finish painting one version completely without being
+// interrupted by new invals/content
+
+class UpdateManager {
+public:
+    UpdateManager();
+
+    ~UpdateManager();
+
+    // swap deferred members in place of painting members
+    void swap();
+
+    void updateInval(const SkRegion& invalRegion);
+
+    void updatePicture(SkPicture* picture);
+
+    bool paint(BaseTile* tile, SkCanvas* canvas, unsigned int* pictureUsed);
+
+    void clearPaintingInval();
+
+    const SkRegion& getPaintingInval() {
+        return m_paintingInval;
+    }
+
+    SkPicture* getPaintingPicture() {
+        // NOTE: only modified on UI thread, so UI thread access doesn't need mutex
+        return m_paintingPicture;
+    }
+
+private:
+    // protect m_paintingPicture
+    //    swap() on UI thread modifies
+    //    paint() on texture gen thread reads
+    android::Mutex m_paintingPictureSync;
+    SkPicture* m_paintingPicture;
+
+    // inval region to be redrawn with the current paintingPicture
+    SkRegion m_paintingInval;
+
+    // most recently received picture, moved into painting on swap()
+    SkPicture* m_deferredPicture;
+
+    // all invals since last swap(), merged with painting inval on swap()
+    SkRegion m_deferredInval;
+};
+
+} // namespace WebCore
+
+#endif //#define UpdateManager_h