Merge "[2/n] Implement OpenTransparentActivityTest flicker test" into udc-qpr-dev am: 9e7ffd2e

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23917799



Change-Id: Ic9a3c594a88977f516b96072e4aeaba48c6fe15b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>