Add support for inverse transform animations.

ui/compositor/transform_animation_curve_adapter.h

Index: ui/compositor/transform_animation_curve_adapter.h
diff --git a/ui/compositor/transform_animation_curve_adapter.h b/ui/compositor/transform_animation_curve_adapter.h
index e721550d3344c6f50cc6837d54895404d61b2128..7c15a49b1d3bf8d53683c9021d0276b15c809a2e 100644
--- a/ui/compositor/transform_animation_curve_adapter.h
+++ b/ui/compositor/transform_animation_curve_adapter.h
@@ -8,12 +8,14 @@
 #include "base/time/time.h"
 #include "cc/animation/animation_curve.h"
 #include "ui/base/animation/tween.h"
+#include "ui/compositor/compositor_export.h"
 #include "ui/gfx/transform.h"
 #include "ui/gfx/transform_util.h"
 
 namespace ui {
 
-class TransformAnimationCurveAdapter :public cc::TransformAnimationCurve {
+class COMPOSITOR_EXPORT TransformAnimationCurveAdapter
+    : public cc::TransformAnimationCurve {
  public:
   TransformAnimationCurveAdapter(Tween::Type tween_type,
                                  gfx::Transform intial_value,
@@ -36,6 +38,32 @@ class TransformAnimationCurveAdapter :public cc::TransformAnimationCurve {
   gfx::DecomposedTransform decomposed_initial_value_;
   gfx::DecomposedTransform decomposed_target_value_;
   base::TimeDelta duration_;
+
+  DISALLOW_ASSIGN(TransformAnimationCurveAdapter);
+};
+
+class COMPOSITOR_EXPORT InverseTransformCurveAdapter
+    : public cc::TransformAnimationCurve {
+ public:
+  InverseTransformCurveAdapter(TransformAnimationCurveAdapter base_curve,
+                               gfx::Transform initial_value,
+                               base::TimeDelta duration);
+
+  virtual ~InverseTransformCurveAdapter();
+
+  virtual double Duration() const OVERRIDE;
+  virtual scoped_ptr<AnimationCurve> Clone() const OVERRIDE;
+  virtual gfx::Transform GetValue(double t) const OVERRIDE;
+  virtual bool AnimatedBoundsForBox(const gfx::BoxF& box,
+                                    gfx::BoxF* bounds) const OVERRIDE;
+
+ private:
+  TransformAnimationCurveAdapter base_curve_;
+  gfx::Transform initial_value_;
+  gfx::Transform effective_initial_value_;
+  base::TimeDelta duration_;
+
+  DISALLOW_ASSIGN(InverseTransformCurveAdapter);
 };
 
 }  // namespace ui