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The shape and location of the window is independent of rendering method,
so move those resources to ScenicWindow where they can be used for both
software & vulkan rendering paths.

Bug: 861853
Test: ozone_demo --ozone-platform=scenic --enable-vulkan (with full series)

Change-Id: I728d9d6fc173dd629b319a5de14072c60156d695

Reviewed-on: https://chromium-review.googlesource.com/1188970Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Commit-Queue: Michael Spang <spang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#586292}