Increase the horizontal gap between shift/delete and normal keys

This change also adds capability to add horizontal padding to the
keyboard.

Bug: 4269094
Change-Id: I805e76b253a497079517c01bd2a976f8702f7e56
diff --git a/java/res/layout/input_basic.xml b/java/res/layout/input_basic.xml
index 7b85bae..86ae82d 100644
--- a/java/res/layout/input_basic.xml
+++ b/java/res/layout/input_basic.xml
@@ -25,6 +25,7 @@
         android:layout_alignParentBottom="true"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
+        android:padding="0dip"
         android:background="@drawable/keyboard_background"
 
         latin:keyBackground="@drawable/btn_keyboard_key"