Prepare for removing WebTransformationMatrix from animation APIs

webkit/compositor_bindings/web_transform_animation_curve_impl.h

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef WebTransformAnimationCurveImpl_h
 #define WebTransformAnimationCurveImpl_h
 
 #include "base/memory/scoped_ptr.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebTransformAnimationCurve.h"
 #include "webkit/compositor_bindings/webkit_compositor_bindings_export.h"
 
 namespace cc {
 class AnimationCurve;
 class KeyframedTransformAnimationCurve;
 }
 
 namespace WebKit {
 
 class WebTransformKeyframe;
+class WebTransformationMatrix;
 
 class WebTransformAnimationCurveImpl : public WebTransformAnimationCurve {
  public:
   WEBKIT_COMPOSITOR_BINDINGS_EXPORT WebTransformAnimationCurveImpl();
   virtual ~WebTransformAnimationCurveImpl();
 
   // WebAnimationCurve implementation.
   virtual AnimationCurveType type() const;
 
   // WebTransformAnimationCurve implementation.
   virtual void add(const WebTransformKeyframe&);
   virtual void add(const WebTransformKeyframe&, TimingFunctionType);
   virtual void add(const WebTransformKeyframe&,
                    double x1,
                    double y1,
                    double x2,
                    double y2);
 
   virtual WebTransformationMatrix getValue(double time) const;
 
   scoped_ptr<cc::AnimationCurve> cloneToAnimationCurve() const;
 
  private:
   scoped_ptr<cc::KeyframedTransformAnimationCurve> curve_;
 };
 
 }
 
 #endif  // WebTransformAnimationCurveImpl_h