Initiate Hotseat drag from long pressing corresponding Taskbar item am: 39938cbc94

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/13779849

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Ic868dd60dcc326be6aae7c531a0aeb8ed2e7d09e