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For lock screen app windows the window manager needs to specify the
initial show state of the window. Ensure the client (chrome) does not
overwrite the aura window show-state property in ash if the client
window has ui::SHOW_STATE_DEFAULT.

Fixes LockScreenNoteTakingTest.Launch pass under SingleProcessMash

Bug: 899055
Test: added to views_mus_unittests

Change-Id: Ib7b6f9a060835ebf3e017737e4b98387a31831c8
Reviewed-on: https://chromium-review.googlesource.com/c/1303273Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Toni Baržić <tbarzic@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604517}