[cros] Go back to EASE_OUT for boot transition

ash/ash_switches.cc

Index: ash/ash_switches.cc
diff --git a/ash/ash_switches.cc b/ash/ash_switches.cc
index 4d75bda384ed6c542e83d7468d4e8e2ba5d08337..32336fc226e24cdcfea57644f914a432f5eddd97 100644
--- a/ash/ash_switches.cc
+++ b/ash/ash_switches.cc
@@ -7,6 +7,12 @@
 namespace ash {
 namespace switches {
 
+// Variation of boot animation that uses Tween::EASE_OUT_2.
+const char kAshBootAnimationFunction2[] = "ash-boot-animation-function2";
+
+// Variation of boot animation that uses Tween::EASE_OUT_3.
+const char kAshBootAnimationFunction3[] = "ash-boot-animation-function3";
+
 // Constrains the pointer movement within a root window on desktop.
 const char kAshConstrainPointerToRoot[] = "ash-constrain-pointer-to-root";