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The screen manager crosapi is used to take snapshots of the screen and
window. This CL adds an ash-chrome only browser-test which confirms that
the implementation of the mojo interface calls returns appropriately
sized snapshots.

Bug: 1094460
Change-Id: I6f65d0ba01b60b82c35a5dd896cf3e2f132e3b56
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2310890
Commit-Queue: Erik Chen <erikchen@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Auto-Submit: Erik Chen <erikchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790656}