Follow the taskbar motion for unstashing via gesture.
When swiping up in the handle area, move the handle slightly up with the
finger movement.
Once reaching a certain threshold, unstash the bubble bar.
If user swipes up past a certain other threshold, and lifts the finger,
expand the bubble bar. Otherwise leave bubble bar in collapsed state.
Only stashed handle or collapsed bar can be swiped up on.
Bug: 325673340
Test: atest NexusLauncherTests:com.android.launcher3.taskbar.bubbles.BubbleBarSwipeControllerTest
Test: swipe up on stashed handle
Test: tap on stashed handle
Test: enable 3 button nav and tap on bubble bar
Flag: com.android.wm.shell.enable_bubble_bar
Change-Id: I6bb3c201cd03f05e2be55ebb0c972c577373ea79
Ats Jenk
26d74b9ec0