Support keyboardHeight and maxKeyboardHeight to Keyboard XML

This change introduces,
- new attribute keyboardHeight to specify default keyboard height.
- new attribute maxKeyboardHeight to specify maximum keyboard height,
  usually specified by percentage to the screen height.
- keyHeight attribute is obsoleted
- new attribute rowHeight to specify a row height, can be specifed as
  percentage of the keyboard height. And verticalGap is included to
  the row height (row height = key height + vertical gap).

Change-Id: I48a2f2661e8a91a998503a847437c1baf1de9b9c
diff --git a/java/res/xml/popup_punctuation.xml b/java/res/xml/popup_punctuation.xml
index 76572b0..6c778c7 100644
--- a/java/res/xml/popup_punctuation.xml
+++ b/java/res/xml/popup_punctuation.xml
@@ -23,7 +23,7 @@
     latin:keyWidth="10%p"
     latin:horizontalGap="0px"
     latin:verticalGap="0px"
-    latin:keyHeight="@dimen/popup_key_height"
+    latin:rowHeight="@dimen/popup_key_height"
 >
     <Row
         latin:rowEdgeFlags="top"