Add GridRows tag to support emoji keyboard

java/res/values-land/dimens.xml

java/res/values/attrs.xml

java/res/values/dimens.xml

java/res/xml/kbd_emoji_category1.xml

java/res/xml/kbd_emoji_category2.xml

java/res/xml/kbd_emoji_category3.xml

java/res/xml/kbd_emoji_category4.xml

java/res/xml/kbd_emoji_category5.xml

java/res/xml/kbd_emoji_category6.xml

java/res/xml/kbd_emoji_recents.xml

java/res/xml/keyboard_layout_set_emoji.xml

java/src/com/android/inputmethod/keyboard/Keyboard.java

...droid/inputmethod/keyboard/internal/CodesArrayParser.java

...ndroid/inputmethod/keyboard/internal/KeyboardBuilder.java