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For ChromeOS, ash (window manager), will handle adjusting the window
size to adhere to the specified aspect ratio.

This change adds a new aura constant to keep track of the window's
aspect ratio, if any. This is used in WindowResizer to determine the new
window bounds.

Bug: 853276
Change-Id: I4c7eaa6252e26ffccf3ac10a4dafd635a3b556d1
Reviewed-on: https://chromium-review.googlesource.com/1164483
Commit-Queue: apacible <apacible@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582010}