Merge "Use Concurrent HashMaps for Callback Registration" into udc-dev am: 1a4e44610f am: d1a2e1f056
Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21644760 Change-Id: I91d048618c18511ec5b2e13c3250454ea6e468ea Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
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