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: Ibed83dea23fb08da02e3ca5b4f5212eca8e09103
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>