Merge "Revert "Remove shadows from launcher icons."" into sc-dev am: 78edf554ae

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/libs/systemui/+/14626350

Change-Id: I4012033c8c183d763690d4da1a940f740e22cf72
tree: 76b152837c3ce62a723e2ee530579d8d3835cbb3
  1. iconloaderlib/
  2. searchuilib/