CC Animation: Expose TargetProperty enum to be aliased in Blink Platform.

cc/animation/animation_events.cc

Index: cc/animation/animation_events.cc
diff --git a/cc/animation/animation_events.cc b/cc/animation/animation_events.cc
index bb4cbb25c657e115dfecbdecc1ee8ce6d3d73445..4d569186519ab88588363f3aa31f166c8c12b21d 100644
--- a/cc/animation/animation_events.cc
+++ b/cc/animation/animation_events.cc
@@ -9,7 +9,7 @@ namespace cc {
 AnimationEvent::AnimationEvent(AnimationEvent::Type type,
                                int layer_id,
                                int group_id,
-                               Animation::TargetProperty target_property,
+                               TargetProperty::Type target_property,
                                base::TimeTicks monotonic_time)
     : type(type),
       layer_id(layer_id),
@@ -17,8 +17,7 @@ AnimationEvent::AnimationEvent(AnimationEvent::Type type,
       target_property(target_property),
       monotonic_time(monotonic_time),
       is_impl_only(false),
-      opacity(0.f) {
-}
+      opacity(0.f) {}
 
 AnimationEvents::AnimationEvents() {}