Merge "Reland "Introduce TaskFragment transition type"" into sc-v2-dev am: c2fc67837e am: 7bc4e550ed

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15638587

Change-Id: If9f321013ee6e70f7bcf37f6fa142c923ab07e08