Refactoring display configuration state to allow generic state objects

ash/display/output_configurator_animation.cc

Index: ash/display/output_configurator_animation.cc
diff --git a/ash/display/output_configurator_animation.cc b/ash/display/output_configurator_animation.cc
index fa84a0d7f31488b736779d729d9e69c026ede6ef..a9eb3a0ddfd04ca7b23bd3032bbf3f3591b7b03b 100644
--- a/ash/display/output_configurator_animation.cc
+++ b/ash/display/output_configurator_animation.cc
@@ -204,7 +204,7 @@ void OutputConfiguratorAnimation::StartFadeInAnimation() {
 }
 
 void OutputConfiguratorAnimation::OnDisplayModeChanged(
-    const std::vector<chromeos::OutputConfigurator::OutputSnapshot>& outputs) {
+    const chromeos::OutputConfigurator::DisplayStateList& outputs) {
   if (!hiding_layers_.empty())
     StartFadeInAnimation();
 }