Merge "When KEYCODE_BACK is received, hide keyboard" into sc-dev am: 24c8ebd88d am: efa47a13f4 am: b8a5ae9b90

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/15107283

Change-Id: I6d2258c16a5dba0e5aeab447531b11bda0f73cec