Send source rect hint to Shell via stopSwipePipToHome am: 2670871505

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/27837995

Change-Id: Id0fb0d3b929531bc11a44f49cdadc91660779470
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>