Ensure previous background color is reapplied when showing a SurfaceView

- This prevents a flash of black if we show the surfaceview again
  after it is hidden

Bug: 152134983
Test: Ensure no flash if previous background color was set and it is
      made visible again
Change-Id: I04d0222521c902da6d29e99ccdbd0aa8ad49917e
1 file changed