Merge "Notifies magnification change for the transitioning target mode" into tm-dev am: b26d2ae8

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/17040106



Change-Id: I78e8f2f5ce587da1dd6359ae84f4acf9212bf68a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>