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Currently, drag and hold gesture for transition from home to overview is
handled by SwipeHomeToOverviewController owned by
HomeLauncherGestureHandler, which means that shelf layout manager's
drag_status_ indicates app list drag while the home-to-overview drag is
in progress.
This causes hotseat not to change its state while the
drag is handled, the behavior which is suboptimal given that home screen
can transition to overview while the gesture pointers are still down
(the shelf should update to reflect the state change immediately).

This cl introduces new drag status type, that enables the shelf layout
manager to treat shelf updates differently while home to overview
gesture is active than when app list drag is active.

BUG=1005366

Change-Id: I555b344a57df0830b5380d48ce98237673aad2d2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1894136
Commit-Queue: Toni Baržić <tbarzic@chromium.org>
Reviewed-by: Manu Cornet <manucornet@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711514}