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Cros splitscreen: do not show black backdrop on the non-snapped side of the screen if there is only one snapped window.

Bug: 818310
Change-Id: I08ced2fcf88da0d65c01253880e7cd49c0d0913c
Reviewed-on: https://chromium-review.googlesource.com/953337Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Commit-Queue: Xiaoqian Dai <xdai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543421}