Merge "Protect account chooser activities against overlay." into qt-dev am:...

Merge "Protect account chooser activities against overlay." into qt-dev am: 7f2257fa am: 683623e8 am: be186dc3 am: 88e38a7d am: 37ff5c9d

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/13191817

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I5b0f76a2f9ea938e219a00e46e103c915bd5c739