[13/n] Enable drawing rounded corners for tiling.

This CL widens the width of the WindowlessWindowManager by 2x the display
corner radius, 1 radius for each tiled app, and handles the new
translation bounds for divider move operations.

Flag: com.android.window.flags.enable_tile_resizing
Test: on device testing of UI
Bug: 376221715
Change-Id: I61f7a0542889b6805d4bc813b55e153bf5a7c71b