Add a Visual Indicator for fullscreen to freeform transitions

Adding a visual indicator that appears when there is a drag event from
the status bar and becomes smaller when we drag below 2x the status bar
height

Link to video example: http://recall/clips/1f25b919-721a-4713-988a-a0da187da442

Bug: 266973706
Test: Manual Testing
Change-Id: Ieb40cdd812f94f18f58b7d0fe2771fa06a73c9fa