[automerger skipped] DO NOT MERGE Handle back button for notification panel am: 2f5e1b4004 am: 5d7be49da6 -s ours am: c72993671b
Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/13408029 MUST ONLY BE SUBMITTED BY AUTOMERGER Change-Id: If7570eea362a26f61586ba33e9f2a9d04af58c78
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