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

ui/gfx/animation/animation_container_observer.h

Index: ui/gfx/animation/animation_container_observer.h
diff --git a/ui/gfx/animation/animation_container_observer.h b/ui/gfx/animation/animation_container_observer.h
index a5051679626507a4de118942f031dc6ab12c34dc..169ed0414858793d13320f040b5a1bc009ed6557 100644
--- a/ui/gfx/animation/animation_container_observer.h
+++ b/ui/gfx/animation/animation_container_observer.h
@@ -5,7 +5,7 @@
 #ifndef UI_GFX_ANIMATION_ANIMATION_CONTAINER_OBSERVER_H_
 #define UI_GFX_ANIMATION_ANIMATION_CONTAINER_OBSERVER_H_
 
-#include "ui/gfx/gfx_export.h"
+#include "ui/gfx/animation/animation_export.h"
 
 namespace gfx {
 
@@ -13,7 +13,7 @@ class AnimationContainer;
 
 // The observer is notified after every update of the animations managed by
 // the container.
-class GFX_EXPORT AnimationContainerObserver {
+class ANIMATION_EXPORT AnimationContainerObserver {
  public:
   // Invoked on every tick of the timer managed by the container and after
   // all the animations have updated.