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

ui/gfx/animation/slide_animation.h

 // Copyright (c) 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 UI_GFX_ANIMATION_SLIDE_ANIMATION_H_
 #define UI_GFX_ANIMATION_SLIDE_ANIMATION_H_
 
 #include "base/macros.h"
 #include "ui/gfx/animation/linear_animation.h"
 #include "ui/gfx/animation/tween.h"
@@ skipping 27 matching lines @@
 //     }
 //   }
 //   void Layout() {
 //     if (animation_->is_animating()) {
 //       hover_image_.SetOpacity(animation_->GetCurrentValue());
 //     }
 //   }
 //  private:
 //   std::unique_ptr<SlideAnimation> animation_;
 // }
-class GFX_EXPORT SlideAnimation : public LinearAnimation {
+class ANIMATION_EXPORT SlideAnimation : public LinearAnimation {
  public:
   explicit SlideAnimation(AnimationDelegate* target);
   ~SlideAnimation() override;
 
   // Set the animation back to the 0 state.
   virtual void Reset();
   virtual void Reset(double value);
 
   // Begin a showing animation or reverse a hiding animation in progress.
   virtual void Show();
@@ skipping 38 matching lines @@
   // How long a hover in/out animation will last for. This defaults to
   // kHoverFadeDurationMS, but can be overridden with SetDuration.
   int slide_duration_;
 
   DISALLOW_COPY_AND_ASSIGN(SlideAnimation);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_ANIMATION_SLIDE_ANIMATION_H_