Add function for animating dialpad hide.

Bug: 14471388
Change-Id: If854c8487801ee1bb93b31ae05d68daa0fa498bc
diff --git a/src/com/android/contacts/common/dialpad/DialpadView.java b/src/com/android/contacts/common/dialpad/DialpadView.java
index eefaaa4..1dade57 100644
--- a/src/com/android/contacts/common/dialpad/DialpadView.java
+++ b/src/com/android/contacts/common/dialpad/DialpadView.java
@@ -173,6 +173,11 @@
         animate().alpha(1.0f).setDuration(KEY_FRAME_DURATION * 20);
     }
 
+    public void animateHide() {
+        setAlpha(1.0f);
+        animate().alpha(0).setDuration(KEY_FRAME_DURATION * 13);
+    }
+
     public EditText getDigits() {
         return mDigits;
     }