Move ui/gfx/animation/ into its own component.

ui/gfx/animation/animation.h

Index: ui/gfx/animation/animation.h
diff --git a/ui/gfx/animation/animation.h b/ui/gfx/animation/animation.h
index 8d8b4d0335b33046a3fb851e5673d50f7083b8f3..e26bb212d3a71a0df5edd882d83d72a1c50c7ad1 100644
--- a/ui/gfx/animation/animation.h
+++ b/ui/gfx/animation/animation.h
@@ -26,7 +26,7 @@ class AnimationDelegate;
 //
 // To subclass override Step, which is invoked as the animation progresses and
 // GetCurrentValue() to return the value appropriate to the animation.
-class GFX_EXPORT Animation : public AnimationContainerElement {
+class ANIMATION_EXPORT Animation : public AnimationContainerElement {
  public:
   explicit Animation(base::TimeDelta timer_interval);
   ~Animation() override;