Add keyboardLetfPadding and keyboardRightPadding attributes

This change splits keyboardHorizontalEdgesPadding attributes of
Keyboard into two attributes.

Change-Id: Iefdb358783b81af4027e8d9e991db36a6c429cf1
diff --git a/java/res/xml-sw600dp-land/kbd_number.xml b/java/res/xml-sw600dp-land/kbd_number.xml
index 63dfc90..a9e8121 100644
--- a/java/res/xml-sw600dp-land/kbd_number.xml
+++ b/java/res/xml-sw600dp-land/kbd_number.xml
@@ -20,7 +20,8 @@
 
 <Keyboard
     xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
-    latin:keyboardHorizontalEdgesPadding="10%p"
+    latin:keyboardLeftPadding="10%p"
+    latin:keyboardRightPadding="10%p"
     latin:keyWidth="18%p"
     latin:touchPositionCorrectionData="@array/touch_position_correction_data_default"
 >