Introduce ui.dll / libui.so for the component build.

ui/base/animation/animation_container_element.h

 // Copyright (c) 2011 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_BASE_ANIMATION_ANIMATION_CONTAINER_ELEMENT_H_
 #define UI_BASE_ANIMATION_ANIMATION_CONTAINER_ELEMENT_H_
 #pragma once
 
 #include "base/time.h"
+#include "ui/ui_api.h"
 
 namespace ui {
 
 // Interface for the elements the AnimationContainer contains. This is
 // implemented by Animation.
-class AnimationContainerElement {
+class UI_API AnimationContainerElement {
  public:
   // Sets the start of the animation. This is invoked from
   // AnimationContainer::Start.
   virtual void SetStartTime(base::TimeTicks start_time) = 0;
 
   // Invoked when the animation is to progress.
   virtual void Step(base::TimeTicks time_now) = 0;
 
   // Returns the time interval of the animation. If an Element needs to change
   // this it should first invoke Stop, then Start.
   virtual base::TimeDelta GetTimerInterval() const = 0;
 
  protected:
   virtual ~AnimationContainerElement() {}
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_ANIMATION_ANIMATION_CONTAINER_ELEMENT_H_