Update window geometry on tiling state change

When there are tiling changes since the last latched state without any
changes in bounds or insets, and if the updated geometry is not sent to
the compositor, there could be gaps seen around the window due to the
geometry information between the app and compositor being out of sync.

Add tiled edges to PlatformWindowDelegate::State, make it a
configure-synced property and send updated geometry when tiled state
changes.

Test: Tested on both mutter and kwin when the window is tiled and/or
loses focus and validated gaps seen before are now fixed.

Fixed: 413007181, 340363673
Change-Id: If07873218c2a3919d50fa9251c071e7bee8d1fa1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6483092
Reviewed-by: Nick Yamane <nickdiego@igalia.com>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Commit-Queue: Orko Garai <orko@igalia.com>
Cr-Commit-Position: refs/heads/main@{#1453555}