Merge "Letterbox resizable fixed orientation activities in multi-window." into...

Merge "Letterbox resizable fixed orientation activities in multi-window." into tm-dev am: 8d7c5727

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/18185147



Change-Id: I007993f7211114c308e26dc267882690a8382dff
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>