Updated IME assets and layouts to support 600dp devices

.../res/drawable-hdpi/keyboard_key_feedback_background.9.png

...drawable-hdpi/keyboard_key_feedback_background_holo.9.png

...drawable-hdpi/keyboard_key_feedback_more_background.9.png

java/res/drawable-hdpi/sym_keyboard_tab.png

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

...drawable-mdpi/keyboard_key_feedback_background_holo.9.png

...e-sw600dp-hdpi/btn_keyboard_key_popup_selected_holo.9.png

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

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

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

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

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

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

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

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

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

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

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

...-sw600dp-hdpi/keyboard_key_feedback_background_holo.9.png

...0dp-hdpi/keyboard_key_feedback_more_background_holo.9.png