Make searchbox expand when entering search UI

Bug: 14900155
Change-Id: Ib6e500ed55db90ad1fa13ba6dd0e141721331ba4
diff --git a/res/layout/search_edittext.xml b/res/layout/search_edittext.xml
index 03c5106..ff9cabb 100644
--- a/res/layout/search_edittext.xml
+++ b/res/layout/search_edittext.xml
@@ -11,7 +11,7 @@
     android:layout_marginRight="@dimen/search_margin_horizontal"
     android:paddingLeft="@dimen/search_box_left_padding"
     android:paddingRight="@dimen/search_box_right_padding"
-    android:background="@drawable/rounded_corner_bg"
+    android:background="@drawable/rounded_corner"
     android:gravity="center_vertical"
     android:elevation="@dimen/search_box_elevation"
     >