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Call CreateAndParentTopLevelWindow from WindowServiceDelegateImpl.
Get the window type like ui/aura/mus/window_tree_client.cc
Pass PropertyConverter, etc. args to avoid ash::WindowManager.
Check access to possibly null WindowManager[Client], etc. ptrs.

Add a unit test, apply properties to windows in test delegates.

Bug: 837695
Change-Id: I9f474c4b2701efc110b0738ae56fb5334d2fa641
Reviewed-on: https://chromium-review.googlesource.com/1055658
Commit-Queue: Michael Wasserman <msw@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558018}