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The test starts dragging an app out of the main shelf, drags it into
the overflow shelf, and while the drag is still in progress, takes a
screenshot.

This is part of trying to reproduce the linked bug and add test
coverage. This test passes, so I'll need to look into what other
conditions are required, or maybe this bug doesn't happen any longer.
Regardless, it doesn't hurt to have this test.

Bug: 997612
Change-Id: I5bbaca6add0c13fa9df6fa04ede43d1b8519c10e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1785679Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Manu Cornet <manucornet@chromium.org>
Cr-Commit-Position: refs/heads/master@{#693909}