Extract common operations for screenshot layer

Mainly sync the the change of [1] to avoid dimming when
running rotation animation.

[1]: Ib5c02635928cb9779e6f7968d2ec0ac9e659420b

Bug: 270123439
Test: Play HDR video and rotate screen.
      Screen should not be dimmed.
Change-Id: Ia5a428e4038efc00cb0cf20d0546c49956695d71