Add margin for Preview ViewPager

Bug: 200785962
Test: Videos attached to the bug
Change-Id: I36672acf63ca1d6b67b42440190bb9790a19ad4f
Merged-In: I36672acf63ca1d6b67b42440190bb9790a19ad4f
(cherry picked from commit 26717b837f9058b6586ef8df4b8f90e1228bdcff)
2 files changed