Add Fade-out/Fade-in animation during output-configuration change.

ash/shell.cc

Index: ash/shell.cc
diff --git a/ash/shell.cc b/ash/shell.cc
index 223438a3b710f9e38c0019c893c0813d2326ad4d..9bc79f8640b1e4eab4b41a9b7275c0123f59d3cc 100644
--- a/ash/shell.cc
+++ b/ash/shell.cc
@@ -99,6 +99,7 @@
 #endif
 
 #if defined(OS_CHROMEOS)
+#include "ash/display/output_configurator_animation.h"
 #include "chromeos/display/output_configurator.h"
 #include "ui/aura/dispatcher_linux.h"
 #endif  // defined(OS_CHROMEOS)
@@ -190,6 +191,8 @@ Shell::Shell(ShellDelegate* delegate)
   ui_controls::InstallUIControlsAura(internal::CreateUIControls());
 #if defined(OS_CHROMEOS)
   // OutputConfigurator needs to get events regarding added/removed outputs.
+  output_configurator_->set_animation_delegate(
+      new internal::OutputConfiguratorAnimation);
   static_cast<aura::DispatcherLinux*>(
       aura::Env::GetInstance()->GetDispatcher())->AddDispatcherForRootWindow(
           output_configurator());