Inflate necessary previews upon user interaction instead of

inflating everything on creation of the screen. This will
improve the speed of opening the screen and refreshing screen upon
commiting change.

Test: Manually tested by interacting with ViewPager and SeekBar.
Bug: 30697309
Change-Id: Ieb2fac95696b8be33fd508f3b75741529b68e946
(cherry picked from commit 5666ddfe)