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

ui/compositor/test/layer_animator_test_controller.cc

Index: ui/compositor/test/layer_animator_test_controller.cc
diff --git a/ui/compositor/test/layer_animator_test_controller.cc b/ui/compositor/test/layer_animator_test_controller.cc
index 6ec2cf3a42380b7a07015ef27d52be18fd143d87..497cb92e9cb98971966ca750f86c7b6fcd579ba2 100644
--- a/ui/compositor/test/layer_animator_test_controller.cc
+++ b/ui/compositor/test/layer_animator_test_controller.cc
@@ -31,9 +31,9 @@ LayerAnimationSequence* LayerAnimatorTestController::GetRunningSequence(
 }
 
 void LayerAnimatorTestController::StartThreadedAnimationsIfNeeded() {
-  std::vector<cc::Animation::TargetProperty> threaded_properties;
-  threaded_properties.push_back(cc::Animation::OPACITY);
-  threaded_properties.push_back(cc::Animation::TRANSFORM);
+  std::vector<cc::TargetProperty::Type> threaded_properties;
+  threaded_properties.push_back(cc::TargetProperty::OPACITY);
+  threaded_properties.push_back(cc::TargetProperty::TRANSFORM);
 
   for (size_t i = 0; i < threaded_properties.size(); i++) {
     LayerAnimationElement::AnimatableProperty animatable_property =