Change-Id: Iab615459c21fa5799a7b30b8649d75347e46c804

This change introduces the following features to Keyboard XML format.

 * "keyXPos" can specify the key X coordinate directly.
 * "keyXPos" can be negative. The X coordinate will be calcluated from
    the right edge of the keyboard toward left.
 * "keyWidth" can be zero to be filled up to the right side.
 * "keyWidth can be negative. The key will be filled up to both sides.
 * Spacer's horizontalGap is renamed as keyWidth, and can be inherited
   from key-style.
 * Spacer can have keyXPos attribute.

Using these syntax, all keyboard layouts have been re-written.

Cherry-Pick: I314b2e8ca2aa145ff9506cbf927140a15685af42
Bug: 4442045
Change-Id: I048fe5eaef020d8472ab577e9d326042bae2f3fa

This change introduces the following features to Keyboard XML format.

 * "keyXPos" can specify the key X coordinate directly.
 * "keyXPos" can be negative. The X coordinate will be calcluated from
    the right edge of the keyboard toward left.
 * "keyWidth" can be zero to be filled up to the right side.
 * "keyWidth can be negative. The key will be filled up to both sides.
 * Spacer's horizontalGap is renamed as keyWidth, and can be inherited
   from key-style.
 * Spacer can have keyXPos attribute.

Using these syntax, all keyboard layouts have been re-written.

Bug: 4442045
Change-Id: I314b2e8ca2aa145ff9506cbf927140a15685af42

Change-Id: I45a29d753103d82b625e55e78f1075497e94396f

Bug: 4442045
Change-Id: I346489b62b424f6fb897b109310b62b2538ef397

Change-Id: Iebeec413f7f7d26fc00102a27c4eaec1fb63f8a1

This change renames resources along with new naming scheme.
  * large to sw600dp  (7" tablet uses phone keyboard layout)
  * xlarge to sw768dp (10" tablet)

Bug: 4436327
Change-Id: I96678fa699d2abcb48022d8878557f1486e839aa