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diff --git a/Source/WebCore/page/animation/CSSAnimationController.h b/Source/WebCore/page/animation/CSSAnimationController.h
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+/*
+ * Copyright (C) 2007 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. 
+ * 3.  Neither the name of Apple Inc. ("Apple") nor the names of
+ *     its contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission. 
+ *
+ * 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.
+ */
+
+#pragma once
+
+#include "AnimationBase.h"
+#include "CSSPropertyNames.h"
+#include <wtf/Forward.h>
+
+namespace WebCore {
+
+class CSSAnimationControllerPrivate;
+class Document;
+class Element;
+class Frame;
+class LayoutRect;
+class RenderElement;
+class RenderStyle;
+
+class CSSAnimationController {
+    WTF_MAKE_FAST_ALLOCATED;
+public:
+    explicit CSSAnimationController(Frame&);
+    ~CSSAnimationController();
+
+    void cancelAnimations(RenderElement&);
+    bool updateAnimations(RenderElement&, const RenderStyle& newStyle, std::unique_ptr<RenderStyle>& animatedStyle);
+    std::unique_ptr<RenderStyle> getAnimatedStyleForRenderer(RenderElement&);
+
+    // If possible, compute the visual extent of any transform animation on the given renderer
+    // using the given rect, returning the result in the rect. Return false if there is some
+    // transform animation but we were unable to cheaply compute its affect on the extent.
+    bool computeExtentOfAnimation(RenderElement&, LayoutRect&) const;
+
+    // This is called when an accelerated animation or transition has actually started to animate.
+    void notifyAnimationStarted(RenderElement&, double startTime);
+
+    WEBCORE_EXPORT bool pauseAnimationAtTime(RenderElement*, const AtomicString& name, double t); // To be used only for testing
+    WEBCORE_EXPORT bool pauseTransitionAtTime(RenderElement*, const String& property, double t); // To be used only for testing
+    WEBCORE_EXPORT unsigned numberOfActiveAnimations(Document*) const; // To be used only for testing
+    
+    bool isRunningAnimationOnRenderer(RenderElement&, CSSPropertyID, AnimationBase::RunningState) const;
+    bool isRunningAcceleratedAnimationOnRenderer(RenderElement&, CSSPropertyID, AnimationBase::RunningState) const;
+
+    WEBCORE_EXPORT bool isSuspended() const;
+    WEBCORE_EXPORT void suspendAnimations();
+    WEBCORE_EXPORT void resumeAnimations();
+    void serviceAnimations();
+
+    WEBCORE_EXPORT void suspendAnimationsForDocument(Document*);
+    WEBCORE_EXPORT void resumeAnimationsForDocument(Document*);
+    WEBCORE_EXPORT bool animationsAreSuspendedForDocument(Document*);
+    void detachFromDocument(Document*);
+    void startAnimationsIfNotSuspended(Document*);
+
+    void beginAnimationUpdate();
+    void endAnimationUpdate();
+
+    WEBCORE_EXPORT bool allowsNewAnimationsWhileSuspended() const;
+    WEBCORE_EXPORT void setAllowsNewAnimationsWhileSuspended(bool);
+    
+    static bool supportsAcceleratedAnimationOfProperty(CSSPropertyID);
+
+#if ENABLE(CSS_ANIMATIONS_LEVEL_2)
+    bool wantsScrollUpdates() const;
+    void scrollWasUpdated();
+#endif
+
+    bool hasAnimations() const;
+
+private:
+    const std::unique_ptr<CSSAnimationControllerPrivate> m_data;
+};
+
+class AnimationUpdateBlock {
+public:
+    AnimationUpdateBlock(CSSAnimationController* animationController)
+        : m_animationController(animationController)
+    {
+        if (m_animationController)
+            m_animationController->beginAnimationUpdate();
+    }
+    
+    ~AnimationUpdateBlock()
+    {
+        if (m_animationController)
+            m_animationController->endAnimationUpdate();
+    }
+    
+    CSSAnimationController* m_animationController;
+};
+
+} // namespace WebCore