Revert "Revert "Improve interaction around showing / hiding the gear behind notifications""

This reverts commit 88eca2aa0e707c06731fc273af4e6181ad743c3c.

It additionally fixes an issue with notification scrolling after gear is displayed
by indicating that the user is no longer swiping by calling onDragCancelled

Change-Id: Ieba0cea35bba9c383d8b5fdca08cb5ff083666c3
3 files changed