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diff --git a/Source/Platform/chromium/public/WebCompositor.h b/Source/Platform/chromium/public/WebCompositor.h
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+++ b/Source/Platform/chromium/public/WebCompositor.h
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+/*
+ * Copyright (C) 2011 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 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 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.
+ */
+
+#ifndef WebCompositor_h
+#define WebCompositor_h
+
+#include "WebCommon.h"
+
+namespace WebKit {
+
+class WebThread;
+
+// This class contains global routines for interacting with the
+// compositor.
+//
+// All calls to the WebCompositor must be made from the main thread.
+class WebCompositor {
+public:
+    // Initializes the compositor. Threaded compositing is enabled by passing in
+    // a non-null WebThread. No compositor classes or methods should be used
+    // prior to calling initialize.
+    WEBKIT_EXPORT static void initialize(WebThread*);
+
+    // Returns whether the compositor was initialized with threading enabled.
+    WEBKIT_EXPORT static bool threadingEnabled();
+
+    // Shuts down the compositor. This must be called when all compositor data
+    // types have been deleted. No compositor classes or methods should be used
+    // after shutdown.
+    WEBKIT_EXPORT static void shutdown();
+
+    // These may only be called before initialize.
+    WEBKIT_EXPORT static void setPerTilePaintingEnabled(bool);
+    WEBKIT_EXPORT static void setPartialSwapEnabled(bool);
+    WEBKIT_EXPORT static void setAcceleratedAnimationEnabled(bool);
+
+protected:
+    virtual ~WebCompositor() { }
+};
+
+} // namespace WebKit
+
+#endif