Merge "Add emoji icon and code as a groundwork"

java/res/drawable-hdpi/ic_emoji_dark.png

java/res/drawable-hdpi/ic_emoji_light.png

java/res/drawable-mdpi/ic_emoji_dark.png

java/res/drawable-mdpi/ic_emoji_light.png

java/res/drawable-xhdpi/ic_emoji_dark.png

java/res/drawable-xhdpi/ic_emoji_light.png

java/res/values/attrs.xml

java/res/values/keyboard-icons-black.xml

java/res/values/keyboard-icons-ics.xml

java/res/values/keyboard-icons-white.xml

java/res/xml-sw600dp/key_styles_common.xml

java/res/xml-sw600dp/rows_10_10_7_symbols.xml

java/res/xml-sw768dp/key_styles_common.xml

java/res/xml/key_styles_common.xml

...droid/inputmethod/keyboard/internal/KeyboardCodesSet.java

...droid/inputmethod/keyboard/internal/KeyboardIconsSet.java

java/src/com/android/inputmethod/latin/Constants.java

java/src/com/android/inputmethod/latin/LatinIME.java