Skeleton for Keyguard security method appear animations.

Bug: 15163546
Change-Id: Id1c6b4f21b8f182f9d00fb903370de5512eaba1b
diff --git a/packages/Keyguard/src/com/android/keyguard/KeyguardPINView.java b/packages/Keyguard/src/com/android/keyguard/KeyguardPINView.java
index ca2d615..4dfda91 100644
--- a/packages/Keyguard/src/com/android/keyguard/KeyguardPINView.java
+++ b/packages/Keyguard/src/com/android/keyguard/KeyguardPINView.java
@@ -114,4 +114,11 @@
     public int getWrongPasswordStringId() {
         return R.string.kg_wrong_pin;
     }
+
+    @Override
+    public void startAppearAnimation() {
+        // TODO: Fancy animation.
+        setAlpha(0);
+        animate().alpha(1).withLayer().setDuration(200);
+    }
 }