Merge "Enable and tune shadow generator." into sc-dev am: 153c35c723 am: 426abeee6d

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/libs/systemui/+/14727293

Change-Id: I8195bb7430cd35269f908af2ba560d952f152c5d
tree: abdf80baa4f6458c37b499819025ae7141e76f43
  1. iconloaderlib/
  2. searchuilib/