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

ui/gfx/animation/throb_animation.h

Index: ui/gfx/animation/throb_animation.h
diff --git a/ui/gfx/animation/throb_animation.h b/ui/gfx/animation/throb_animation.h
index 1eaedd19799a674cd3cdf10b0a88bc28d42a9d6f..7226382148f9d61c6fea777df3f2e23fc703057e 100644
--- a/ui/gfx/animation/throb_animation.h
+++ b/ui/gfx/animation/throb_animation.h
@@ -17,7 +17,7 @@ namespace gfx {
 //
 // A ThrobAnimation has two durations: the duration used when behavior like
 // a SlideAnimation, and the duration used when throbbing.
-class GFX_EXPORT ThrobAnimation : public SlideAnimation {
+class ANIMATION_EXPORT ThrobAnimation : public SlideAnimation {
  public:
   explicit ThrobAnimation(AnimationDelegate* target);
   ~ThrobAnimation() override {}