Updated IME assets and layouts to support 600dp devices

java/res/drawable-sw600dp-mdpi/sym_keyboard_tab_holo.png

...-sw600dp-xhdpi/btn_keyboard_key_popup_selected_holo.9.png

java/res/drawable-sw600dp-xhdpi/hint_popup_holo.9.png

java/res/drawable-sw600dp-xhdpi/key_hint_num0_holo.9.png

java/res/drawable-sw600dp-xhdpi/key_hint_num1_holo.9.png

java/res/drawable-sw600dp-xhdpi/key_hint_num2_holo.9.png

java/res/drawable-sw600dp-xhdpi/key_hint_num3_holo.9.png

java/res/drawable-sw600dp-xhdpi/key_hint_num4_holo.9.png

java/res/drawable-sw600dp-xhdpi/key_hint_num5_holo.9.png

java/res/drawable-sw600dp-xhdpi/key_hint_num6_holo.9.png

java/res/drawable-sw600dp-xhdpi/key_hint_num7_holo.9.png

java/res/drawable-sw600dp-xhdpi/key_hint_num8_holo.9.png

java/res/drawable-sw600dp-xhdpi/key_hint_num9_holo.9.png

...sw600dp-xhdpi/keyboard_key_feedback_background_holo.9.png

...dp-xhdpi/keyboard_key_feedback_more_background_holo.9.png

...es/drawable-sw600dp-xhdpi/sym_keyboard_numsymbol_holo.png

java/res/drawable-sw600dp-xhdpi/sym_keyboard_tab_holo.png

...e-sw768dp-hdpi/btn_keyboard_key_popup_selected_holo.9.png

java/res/drawable-sw768dp-hdpi/hint_popup_holo.9.png

...-sw768dp-hdpi/keyboard_key_feedback_background_holo.9.png