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

cc/animation/element_animations.cc

Index: cc/animation/element_animations.cc
diff --git a/cc/animation/element_animations.cc b/cc/animation/element_animations.cc
index cd3a7366b0eaf209e32fdd3f81ebda5d7f57c517..a1ac032813979d839e18ec8c45b2b7e00c5439a0 100644
--- a/cc/animation/element_animations.cc
+++ b/cc/animation/element_animations.cc
@@ -239,7 +239,7 @@ void ElementAnimations::DestroyPendingValueObserver() {
 
 void ElementAnimations::NotifyAnimationStarted(
     base::TimeTicks monotonic_time,
-    Animation::TargetProperty target_property,
+    AnimationTargetProperty::Enum target_property,
     int group) {
   for (PlayersListNode* node = players_list_->head();
        node != players_list_->end(); node = node->next()) {
@@ -250,7 +250,7 @@ void ElementAnimations::NotifyAnimationStarted(
 
 void ElementAnimations::NotifyAnimationFinished(
     base::TimeTicks monotonic_time,
-    Animation::TargetProperty target_property,
+    AnimationTargetProperty::Enum target_property,
     int group) {
   for (PlayersListNode* node = players_list_->head();
        node != players_list_->end(); node = node->next()) {
@@ -261,7 +261,7 @@ void ElementAnimations::NotifyAnimationFinished(
 
 void ElementAnimations::NotifyAnimationAborted(
     base::TimeTicks monotonic_time,
-    Animation::TargetProperty target_property,
+    AnimationTargetProperty::Enum target_property,
     int group) {
   for (PlayersListNode* node = players_list_->head();
        node != players_list_->end(); node = node->next()) {