Use PreloadWallpapersLayoutListener again

During refactor, we lost the usage of
PreloadWallpapersLayoutListener which meant we were not
caching wallpaper previews, causing flicker.

Fixes: 133431281

Change-Id: I85bb0a855069f3f2d265d9dba32c43fa28687595
2 files changed
tree: ce472f1620834fd1e07345f634359209e7d898a3
  1. res/
  2. robolectric_tests/
  3. src/
  4. src_override/
  5. Android.mk
  6. AndroidManifest.xml