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

cc/layers/layer_impl.h

Index: cc/layers/layer_impl.h
diff --git a/cc/layers/layer_impl.h b/cc/layers/layer_impl.h
index 3e23310b8cc4793e8e35b0b291ec3cdb4dc4e9b3..e8f6a2ac5241d11eb136fa688654b5e2f8316aa9 100644
--- a/cc/layers/layer_impl.h
+++ b/cc/layers/layer_impl.h
@@ -119,13 +119,13 @@ class CC_EXPORT LayerImpl : public LayerAnimationValueObserver,
 
   // AnimationDelegate implementation.
   void NotifyAnimationStarted(base::TimeTicks monotonic_time,
-                              Animation::TargetProperty target_property,
+                              TargetProperty::Type target_property,
                               int group) override{};
   void NotifyAnimationFinished(base::TimeTicks monotonic_time,
-                               Animation::TargetProperty target_property,
+                               TargetProperty::Type target_property,
                                int group) override;
   void NotifyAnimationAborted(base::TimeTicks monotonic_time,
-                              Animation::TargetProperty target_property,
+                              TargetProperty::Type target_property,
                               int group) override{};
 
   // Tree structure.
@@ -550,8 +550,7 @@ class CC_EXPORT LayerImpl : public LayerAnimationValueObserver,
 
   // This includes all animations, even those that are finished but haven't yet
   // been deleted.
-  bool HasAnyAnimationTargetingProperty(
-      Animation::TargetProperty property) const;
+  bool HasAnyAnimationTargetingProperty(TargetProperty::Type property) const;
 
   bool HasFilterAnimationThatInflatesBounds() const;
   bool HasTransformAnimationThatInflatesBounds() const;