Added a dark/light variation.
Other files that might also need an update:
btn_check_label_background_light.9.png
btn_radio_label_background_light.9.png
btn_check_label_background.9.png
btn_radio_label_background.9.png
Pressed state is nearly invisible in light theme. To be tested with new background color.
Change-Id: Ibd312044364e08f1e789830ddd4c3af5cef30be1
8584909e7f