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The expectation is that the root surface fills the display space. This
ensures that sub-surfaces with negative origins don't cause the root
surface to be shifted and the host window resized.

Bug: 1015185
Test: Manually with test fullscreen_wayland_client
Test: Compare behavior while running with "weston --shell fullscreen-shell.so"
Change-Id: Id67f6e0584002329bf9941843ae6eb27c01c7225
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1866608
Commit-Queue: Daniel Nicoara <dnicoara@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707019}