Merge "fix(magnification thumbnail): pretty up the thumbnail for better...

Merge "fix(magnification thumbnail): pretty up the thumbnail for better visibility" into udc-dev am: ffc35a3e am: b7c20887

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22083582



Change-Id: If9c2ca61fcfb74fa16b60568a462c8603f65e52b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>