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: I6e884fcd350cbe43d055fa8b497e00242e1cc8f8