Let floating windows on watches fill screen

This change allows devices to specify that floating windows do not strictly need to wrap content - but rather they can fill screen if needed. This is intended specifically for devices with small form factors/displays.

This addresses some inconsistencies with Wear & Dialogs specifically (as floating windows have implicit bearing on visibility - i.e. parent occlusion being dependent on ActivityInfo#isTranslucentOrFloating)

Fixes: b/232341122, b/231638625, b/294275950
Test: check dialogs backgrounds
Change-Id: I1bee8b973463c2d1fa04234ffeb9efbc48054a94