[automerger skipped] Merge "Re-Introduce synchronization locking" into tm-dev...

[automerger skipped] Merge "Re-Introduce synchronization locking" into tm-dev am: c2c9fbe6 -s ours

am skip reason: Merged-In I5050eb2cbb15bc1245c91efb72e3d4a417f435e5 with SHA-1 15e64537 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/17325489

Change-Id: Ib31a3446ce3c3d13a82a2039413323b378079e96