Merge "Allow ACTIVITY_TYPE_RECENTS to have multiple root tasks" into main am: 7a0fa2c8e8 am: 20d7df51d3

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2804293

Change-Id: Ice9c0615da45d07fef1ca07c57f65d5594aa9100
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>